Picnic basket (6)
I believe the answer is:
hamper
'picnic basket' is the definition.
(as in a food hamper)
This is all the clue.
(Other definitions for hamper that I've seen before include "Obstruct with picnic basket" , "Prevent free movement" , "Christmas basket" , "Obstruct or delay with food basket" , "Hinder, impede" .)