Look for bird (6)
I believe the answer is:
gander
I believe this clue is a double definition.
'look' is the first definition.
(informal term for a look or glance)
'bird' is the second definition.
(gander is a kind of bird)
'for' acts as a link.
(Other definitions for gander that I've seen before include "Looking at something - ranged (anag)" , "Male 7 across" , "He has webbed feet" , "male member of the Anatidae family" , "Male goose; look (colloq.)" .)