Possible Clues:

• Instrumentalist
• A grand player, perhaps, from his score
• Is paint out for the musician?
• Nick Cave or Alicia Keys
• Key worker, as in working like a miner?
• Thespian is taking part as keyboard exponent
• Rachmaninoff, e.g.
• Scotsman is participating in physical training as a player
• For him the keys are always to hand
• Pat is in effect a key man