We go in for duck (6)

I believe the answer is:

wigeon

I'm a little stuck... Click here to teach me more about this clue!

'for duck' is the definition.
(wigeon is a kind of duck)

'we go in' is the wordplay.
'we go in' can be anagrammed to 'WIGEON'.
However, I'm not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for wigeon that I've seen before include "Duck with whistling call" , "flier" , "Breed of duck" , "Duck, related to mallard and teal" , "Freshwater duck" .)

I've seen this clue in The Globe and Mail.

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