Saves, somehow, an entrapped girl (7)

I believe the answer is:

vanessa

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'girl' is the definition.

I can't explain the remainder of the clue.

(Other definitions for vanessa that I've seen before include "Girl's name; red admiral, painted lady genus" , "Red admiral butterfly" , "Girl's name - butterfly genus" .)

I've seen this clue in the Evening Standard.

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