Crossword Genius

Deeside bird? (3)

Ross

I believe the answer is:

jay

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'bird?' is the definition.
(jay is a kind of bird)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for jay that I've seen before include "Colourful type of crow" , "-- Gatsby, F. Scott Fitzgerald character" , "Garden bird" , "Colourful British bird" , "Bird of the crow family with blue plumage" .)

I've seen this clue in the Evening Standard.
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