Backroom trainer taking time to make bus (10)

I believe the answer is:

motorcoach

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'bus' is the definition.
(I know that bus can be written as motorcoach)

'backroom trainer' is the wordplay.
'backroom' becomes 'motor' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'trainer' becomes 'coach' (coach is a kind of trainer).
'motor'+'coach'='MOTORCOACH'

'taking time to make' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

I've seen this clue in The Irish Times.

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