Relative interrupted very short blowhard (7)

I believe the answer is:

vaunter

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'relative interrupted very short blowhard' is the definition.
'vaunter' can be an answer for 'blowhard' (synonyms). I'm not certain of the 'relative interrupted very short' bit.

'very short blowhard' is the wordplay.
'very short' becomes 'v' (abbreviation; 'short' indicates an abbreviation).
'blowhard' becomes 'aunter' (I can't explain this - if you can you should give a lot more credence to this answer).
'v'+'aunter'='VAUNTER'

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I've seen this clue in the Sydney Morning Herald.

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