Feed like a duck (6)
I believe the answer is:
dabble
'feed like a duck' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for dabble that I've seen before include "Take cursory interest (in)" , "Work (at) frivolously" , "Take dilettante interest (in)" , "Try something briefly and superficially" , "Take desultory interest" .)