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For a girl to be in a new belt is quite justifiable (7)

Ross

I believe the answer is:

tenable

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'justifiable' is the definition.
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(Other definitions for tenable that I've seen before include "Able to be held" , "Possible to be defended" , "Capable of being kept" , "Able to be defended against attack or objection" , "Believable" .)

I've seen this clue in the Evening Standard.
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