Air of invention (4)

I believe the answer is:

vent

'air' is the definition.
(both can mean to express or reveal)

'of invention' is the wordplay.
'of' indicates a hidden word.
'VENT' is hidden within 'invention'.

(Other definitions for vent that I've seen before include "[BLOWHOLE] ?" , "Give outlet as to feelings" , "Broadcast" , "Express freely as with emotions" , "Opening for air" .)

I've seen this clue in The Daily Express and The Mirror.

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