Crossword Genius

An outright bird painter? (5)

Ross

I believe the answer is:

corot

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'painter?' is the definition.
(I know that Corot is a painter)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for corot that I've seen before include "Fr. landscape artist, d. 1875" , "18c French painter" , "He painted" , "19th century French painter" , "French landscape painter, d. 1875" .)

I've seen this clue in the Evening Standard.
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