Crossword Genius

Impair appeal when going topless (4)

Ross

I believe the answer is:

harm

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'impair' is the definition.
(I've seen this in another clue)

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

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(Other definitions for harm that I've seen before include "Detriment" , "Damage, hurt" , "Wound" , "See 13" , "Trials, exams" .)

I've seen this clue in The Times.
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