Crossword Genius

Ventilation aid in vehicle kept by former supporter (9,3)

Ross

I believe the answer is:

extractor fan

'ventilation aid' is the definition.
(device assisting with ventilation)

'vehicle kept by former supporter' is the wordplay.
'vehicle' becomes 'tractor' (tractor is a kind of vehicle).
'kept by' indicates putting letters inside.
'former' becomes 'ex' (prefix meaning former or onetime).
'supporter' becomes 'fan' (fan is a kind of supporter).
'ex'+'fan'='exfan'
'tractor' put inside 'exfan' is 'EXTRACTOR FAN'.

'in' is the link.

(Other definitions for extractor fan that I've seen before include "Device to remove stale air or fumes" , "Kitchen odour remover" .)

I've seen this clue in The Telegraph.
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