Car reverses in an inimitable way (4)
I believe the answer is:
mini
'car' is the definition.
(Mini Cooper)
'reverses in an inimitable way' is the wordplay.
'reverses' is a reversal indicator.
'an inimitable way' becomes 'im' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'in'+'im'='inim'
'inim' reversed gives 'MINI'.
Can you help me to learn more?
(Other definitions for mini that I've seen before include "Once fashionable skirt" , "Italian Job car?" , "Baby" , "Brief" , "Iconic economy car (introduced in 1959)" .)