Crossword Genius

Not pretty clear? (5)

Ross

I believe the answer is:

plain

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'clear?' is the definition.
('plain' can be a synonym of 'clear')

I don't understand the rest of the clue.

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(Other definitions for plain that I've seen before include "Evident; not fancy" , "lament" , "Simple, ordinary" , "Straightforward" , "Clear - open - grassland" .)

I've seen this clue in the Evening Standard.
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