Cooler? One might be now about farm vehicles! (9,3)

I believe the answer is:

extractor fan

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'farm vehicles' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'cooler? one might be now about' is the wordplay.
'cooler?' becomes 'extractor' (as in an extractor fan, something that cools).
'one might be now' becomes 'naf' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'about' is a reversal indicator.
'naf' back-to-front is 'fan'.
'extractor'+'fan'='EXTRACTOR FAN'

Can you help me to learn more?

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

I've seen this clue in The Times.

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