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Having let one in, became chatty (6,2)

Ross

I believe the answer is:

opened up

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'chatty' is the definition.
The answer and definition are not the same part of speech. However, adjectives and past participle verbs can occasionally mean the same thing.

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(Other definitions for opened up that I've seen before include "made disclosure" , "started talking" , "started shooting" , "Poured heart out" , "Offered a freer view" .)

I've seen this clue in the Evening Standard.
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