Car test - nothing's right! (5)

I believe the answer is:

motor

'car' is the definition.
(thesaurus)

'test nothing's right' is the wordplay.
'test' becomes 'mot' (**).
'nothing' becomes 'o' (looks like zero - 0).
'right' becomes 'r' (common abbreviation).
'mot'+'o'+'r'='MOTOR'

(Other definitions for motor that I've seen before include "Car - car's engine" , "Car (colloq,)" , "Driver" , "Internal combustion engine" , "(Transport using) engine" .)

I've seen this clue in the Evening Standard.

Want a hint initially instead of a full solution? Install my app