Course taken by piano performer (6)
I believe the answer is:
player
This clue could be a double definition.
'course taken by piano' is the first definition.
'player' can be an answer for 'piano' (player piano is a kind of piano). I'm not sure about the 'course taken by' bit.
'performer' is the second definition.
(player is a kind of performer)
Can you help me to learn more?
(Other definitions for player that I've seen before include "South African golfer, b. 1935" , "film, on piano" , "Actor; sportsman" , "powerful participant" , "Active sportsperson" .)