Crossword Genius

Fair description of Polly? (6)

Ross

I believe the answer is:

pretty

I'm a little stuck... Click here to teach me more about this clue!

'fair' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for pretty that I've seen before include "Pleasing on the eye" , "like a kettle of fish" , "comely" , "Fair - fairly" , "Lovely" .)

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