Crossword Genius

Tan ruined when switching sides (5)

Ross

I believe the answer is:

brown

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

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for brown that I've seen before include "Former PM" , "cook to a rich colour?" , "It is used for wrapping" , "Kind of sweetener" , "Labour PM, b. 1951" .)

I've seen this clue in The Guardian.
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