Crossword Genius

Mistake for a girl (4)

Ross

I believe the answer is:

kate

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'girl' is the definition.
(girl's name)

I cannot understand how the remainder of the clue works.

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(Other definitions for kate that I've seen before include "Katherine (dim.)" , "Cole Porter musical 'Kiss Me ....'" , "'Kiss me ___' (show)" , "'Kiss me, ---' (Shrew)" .)

I've seen this clue in the Evening Standard.
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