Surface of mine, which allows for quick maintenance (7)
I believe the answer is:
pitstop
'maintenance' is the definition.
(I know that pitstop is a type of maintenance)
'surface of mine which allows for quick' is the wordplay.
I cannot quite understand how this works, but
'surface' could be 'top' (top is a kind of surface) and 'top' is found in the answer.
'mine' could be 'pit' (as in a mining pit) and 'pit' is found within the answer.
A single letter 's' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for pitstop that I've seen before include "Racing car service halt" , "Pause for refuelling etc during race" , "Brief interval for re-fuelling" , "Time taken in motor racing to fit a 3, for instance" , "Racing car's pause to refuel, etc" .)