When reversing, run over cat in drive (5)
I believe the answer is:
motor
'drive' is the definition.
(I know that drive can be written as motor)
'when reversing run over cat' is the wordplay.
'when reversing' shows that the letters should be reversed in order.
'run' becomes 'r' (cricket abbreviation).
'over' becomes 'o' (cricket abbreviation).
'cat' becomes 'tom' (a tom is a male cat).
'r'+'o'+'tom'='rotom'
'rotom' reversed gives 'MOTOR'.
'in' is the link.
(Other definitions for motor that I've seen before include "Drive" , "go quickly" , "Make good progress" , "Move quickly" , "Car - car's engine" .)