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 the answer is hidden within the clue.
'VENT' can be found hidden inside '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 Mirror and The Daily Express.

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