Wild duck (7)

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mallard

'wild duck' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for mallard that I've seen before include "Kind of duck" , "web-footed bird" , "Variety of duck" , "Ancestor of all domestic ducks" , "Oldest breed of duck" .)

I've seen this clue in the LA Times, The Guardian and the Penny Press.

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