Group of geese (6)
I believe the answer is:
gaggle
'group of geese' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for gaggle that I've seen before include "Collective noun for geese" , "flock of birds" , "Cackling sound" , "Alternative name for a flock of geese" , "Group of geese" .)