Vehicle one’s taken into allotment? I’m not driving on this (9)
I believe the answer is:
autopilot
'into allotment? i'm not driving on this' is the definition.
The definition suggests a singular noun which matches the answer.
'vehicle one's' is the wordplay.
'vehicle' becomes 'auto' (auto is a kind of vehicle).
'one's' becomes 'pilot' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'auto'+'pilot'='AUTOPILOT'
'taken' acts as a link.
Can you help me to learn more?
(Other definitions for autopilot that I've seen before include "Airman's 'George'" , "course controller" , "It can fly plane" , "air traffic controller" , "not concentrating on it" .)