Such transport is for the ministry, otherwise (5)
I believe the answer is:
motor
'such transport' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'for the ministry otherwise' is the wordplay.
I cannot really understand how this works, but
'for' could be 'to' (eg both can mean 'in the opinion of') and 'to' is found in the answer.
'otherwise' could be 'or' and 'or' is found in the answer.
A single letter 'm' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'is' acts as a link.
Can you help me to learn more?
(Other definitions for motor that I've seen before include "Car (informal)" , "Engine - relating to movement" , "Make good progress" , "Move quickly" , "Driver" .)