A bit of skill at the piano (4)
I believe the answer is:
part
'a bit of' is the definition.
'skill at the piano' is the wordplay.
'skill' becomes 'art' (both can mean a talent).
'at' is a charade indicator (letters next to each other) (I've seen this in other clues).
'the piano' becomes 'p' (musical abbreviation).
'art' after 'p' is 'PART'.
(Other definitions for part that I've seen before include "Sever; portion" , "Piece, segment" , "Separate - role" , "unemployed actor hopes for" , "Region" .)