Crossword Genius

Aquatic birds reportedly go south (5)

Ross

I believe the answer is:

terns

'aquatic birds' is the definition.
(tern is a kind of aquatic bird)

'reportedly go south' is the wordplay.
'reportedly' shows a homophone (sound like).
'go' becomes 'turn' (as in one's go or turn in a game).
'south' becomes 's' (abbreviation).
'turn' is a homophone of 'tern'.
'tern'+'s'='TERNS'

(Other definitions for terns that I've seen before include "Sea bird with long forked tail" , "Seabirds" , "Sea birds with long forked tails" , "Rents out these birds" , "Aquatic birds" .)

I've seen this clue in The Telegraph.
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