A test for one's wheels (3)
I believe the answer is:
mot
'a test' is the definition.
(as in an MOT test for a vehicle)
'for one's wheels' is the wordplay.
'for' becomes 'to' (eg both can mean 'in the opinion of').
'one's' becomes 'm' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'wheels' says the letters should be written backwards (to wheel can mean to turn around).
'to'+'m'='tom'
'tom' reversed gives 'MOT'.
Can you help me to learn more?
(Other definitions for mot that I've seen before include "type of test" , "Witty saying" , "Word in France, bon perhaps" , "Vehicle check" , "Clever remark" .)