Crossword Genius

Not pretty flat? (5)

Ross

I believe the answer is:

plain

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'flat?' is the definition.
(I know that un-notched can be written as plain)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for plain that I've seen before include "Clear, candid" , "Unadorned on flat area" , "Undecorated; flat area" , "Simple, unadorned" , "Unvarnished" .)

I've seen this clue in the Evening Standard.
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