Crossword Genius

Might one see a jay beside this river? (3)

Ross

I believe the answer is:

dee

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'this river?' is the definition.
(River Dee)

I don't understand the rest of the clue.

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(Other definitions for dee that I've seen before include "River of Scotland" , "Welsh banker?" , "Balmoral's river" , "Scots river" , "John ---, Elizabethan mage" .)

I've seen this clue in the Evening Standard.
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