Crossword Genius

Bird man on board (4)

Ross

I believe the answer is:

rook

I believe this is a double definition.

'bird' is the first definition.
(rook is a kind of bird)

'man on board' is the second definition.
(chess)

(Other definitions for rook that I've seen before include "Rank - and - file man" , "Species of crow" , "Ringing in the ears" , "Another name for castle in chess" , "embattled man" .)

I've seen this clue in the Sydney Morning Herald.
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