A flightless marine bird of the order Sphenisciformes of cool southern regions (7)

I believe the answer is:

penguin

(Other definitions for penguin that I've seen before include "swimmer" , "Chocolate biscuit" , "Antarctic seabird with flippers for wings" , "Waddling bird" , "Flightless sea bird" .)

I've seen this clue in The Independent.

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