Crossword Genius

Check-up of a vehicle or a machine (5)

Ross

I believe the answer is:

motor

I'm a little stuck... Click here to teach me more about this clue!

'a machine' is the definition.
(I know that motor is a type of machine)

'check-up of a vehicle' is the wordplay.
'check' becomes 'MOT' (MOT check for a vehicle).
'up of' says the letters should be written backwards (I've seen 'upped' mean this (in down clue, made to go up)).
'a vehicle' becomes 'ro' (I am not sure about this - if you are sure you should believe this answer much more).
'ro' written backwards gives 'or'.
'mot'+'or'='MOTOR'

'or' is the link.

Can you help me to learn more?

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

I've seen this clue in The Mirror.
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