Portion, bit (5)
I believe the answer is:
piece
I believe this clue is a double definition.
'portion' is the first definition.
(I know that piece is a type of portion)
'bit' is the second definition.
(I know that bit can be written as piece)
(Other definitions for piece that I've seen before include "Queen on board, perhaps" , "Scrap - musical work" , "rook, perhaps" , "Musical work; bit" , "Part - portion" .)