Girl hugging her old flame, is it appropriate? (6)

I believe the answer is:

annexe

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But I can't explain it at all! Could you help me understand?

(Other definitions for annexe that I've seen before include "Building attached to a larger one" , "outbuilding" , "Building joined to a larger one" , "extra space" , "Attached (set of) room(s)" .)

I've seen this clue in The Hindu.

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