Look for a goose (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)
'a goose' is the second definition.
(gander is a kind of goose)
'for' acts as a link.
(Other definitions for gander that I've seen before include "He has webbed feet" , "town in Newfoundland" , "Male bird - look" , "Butchers - goose" , "glance" .)