Small fruit basket (6)
I believe the answer is:
punnet
'small fruit basket' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for punnet that I've seen before include "Little box (of strawberries?)" , "Small basket for measuring fruit" , "Shallow fruit basket" , "Source of fruit" , "Small light basket, for strawberries say" .)