Chas, that's the best you could come up with? How about:
A professional is a member of a profession or any person who earns their living from a specified professional activity. The term also describes the standards of education and training that prepare members of the profession with the particular knowledge and skills necessary to perform their specific role within that profession. In addition, most professionals are subject to strict codes of conduct, enshrining rigorous ethical and moral obligations.[1] Professional standards of practice and ethics for a particular field are typically agreed upon and maintained through widely recognized professional associations, such as the IEEE.[2] Some definitions of "professional" limit this term to those professions that serve some important aspect of public interest [3] and the general good of society.[4][5]
In some cultures, the term is used as shorthand to describe a particular social stratum of well-educated workers who enjoy considerable work autonomy and who are commonly engaged in creative and intellectually challenging work. (From Wikipedia)
How about this one:
[pruh-fesh-uh-nl]
adjective
1.
following an occupation as a means of livelihood or for gain:
a professional builder.
2.
of, relating to, or connected with a profession :
professional studies.
3.
appropriate to a profession :
professional objectivity.
4.
engaged in one of the learned professions :
A lawyer is a professional person.
5.
following as a business an occupation ordinarily engaged in as a pastime:
a professional golfer.
6.
making a business or constant practice of something not properly to be regarded as a business: “A salesman,” he said, “is a professional optimist.”.
7.
undertaken or engaged in as a means of livelihood or for gain:
professional baseball.
noun
10.
a person who belongs to one of the professions, especially one of the learned professions.
11.
a person who earns a living in a sport or other occupation frequently engaged in by amateurs:
a golf professional.
12.
an expert player, as of golf or tennis, serving as a teacher, consultant, performer, or contestant; pro.
13.
a person who is expert at his or her work:
You can tell by her comments that this editor is a real professional.
(From Dictionary.com)
Now, I as I said earlier, I know a lot of pro players, three of which were Peabody trained, two that have big bands and write their own scores, and several that could play with any symphony and play as directed without having second thoughts. I considered Joe Ayala a pro player and while he preferred playing a grand piano, his income was generated playing an arranger keyboard. Helmut Lict can play just about any instrument that has keys, and loves playing the grand piano, but he generates the bulk of his income playing an arranger keyboard. Helmut was trained professionally in Berlin, Germany. Jerry Burns, currently retired, is a Peabody trained pianist. He was in the US Army Band, and leaving the Army went to work for the Zim Zemeral Orchestra for three decades playing an arranger keyboard. Jerry is a pro player. The list is endless.
My entire point about professional players, is that they will and do purchase arranger keyboards - and do not look down their noses at arranger keyboards, or arranger keyboard players. None of the pro players that I know, personally, prefer a synth over an arranger, especially when it comes to making a living on stage.
As for me, I'm just a retired, hack entertainer - not a musician. However, everyone considered me a pro entertainer, and I managed to make a few hundred dollars in the business. I had no formal musical training, learned what I know on my own, school of hard knocks!
Not everyone in this business that has been successful was a trained musician. Classic example: Irving Berlin. Was he a pro? You betcha! There are lots of Irving Berlins out there - I'm just not among them.
Sorry for the rant,
Gary