Crossword Genius

It's my cunning, being vague (5)

Ross

I believe the answer is:

misty

'vague' is the definition.
(thesaurus)

'it's my cunning' is the wordplay.
'cunning' indicates an anagram.
'its'+'my'='itsmy'
'itsmy' is an anagram of 'MISTY'.

'being' is the link.

(Other definitions for misty that I've seen before include "unclear" , "Cloudy, foggy" , "Indistinct in outline" , "Foggy; dim in outline" , "Slightly fogged" .)

I've seen this clue in the Evening Standard.
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