Crossword Genius

A bird seeking a mate? (4)

Ross

I believe the answer is:

rook

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

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for rook that I've seen before include "Rip off - bird" , "journalist Jean" , "Swindle; castle" , "Species of crow" , "Steal - castle" .)

I've seen this clue in the Evening Standard.
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