Piece of potpourri (5)
I believe the answer is:
petal
'piece of potpourri' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for petal that I've seen before include "Small seal set in a ring" , "Plate (anag.)" , "One piece of corolla" , "Bit of blooming" , "Colourful flower part" .)