Crossword Genius

Buttonhole the girl (4)

Ross

I believe the answer is:

rose

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This might be a double definition.

'buttonhole' is the first definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'girl' is the second definition.

'the' is the link.

Can you help me to learn more?

(Other definitions for rose that I've seen before include "increased in price" , "Flower; increased" , "Old song 'The last . . . of summer'" , "13 flower" , "''That which we call a ..., by any other name would smell as sweet'' (Romeo and Juliet)" .)

I've seen this clue in the Evening Standard.
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