Crossword Genius

Backing out of rehearsals is wrong for him (3)

Ross

I believe the answer is:

her

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'for him' is the definition.
(thesaurus)

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

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(Other definitions for her that I've seen before include "The female's" , "Belonging to a female" , "That lady's" , "That lady" , "Pronoun used of ship" .)

I've seen this clue in the Evening Standard.
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