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Distortion
isn’t
commonly
cosmetic
(3,5)
Distortion isn’t commonly cosmetic (3,5)
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The definition is at the end of the clue.
How the clue works
Look at cosmetic — that's your definition, since war paint is decorative face make-up. The wordplay builds the answer in two parts: distortion gives you WARP, and isn't commonly gives you AINT (the colloquial form), and you just stick them together to get WARPAINT, written as WAR PAINT.