Crossword Genius

Drink upset duck (7)

Ross

I believe the answer is:

pintail

'duck' is the definition.
(pintail is a kind of duck)

'drink upset' is the wordplay.
'drink' becomes 'pint' (I've seen this before).
'upset' becomes 'ail' (I've seen this before).
'pint'+'ail'='PINTAIL'

(Other definitions for pintail that I've seen before include "Breed of duck" , "Species of duck" .)

I've seen this clue in The Independent.
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