Crossword Genius

Duck (7)

Ross

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3 4 5

7

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

This is all the clue.

(Other definitions for mallard that I've seen before include "Variety of duck" , "Oldest breed of duck" , "Engine holding the world speed record for a steam locomotive, set at 123mph in 1938" , "Type of duck - world speed record holding steam engine (1938)" , "The famous steam train" .)

I've seen this clue in The Independent, the Evening Standard and the Penny Press.
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