Clean up a chap's vehicles (6)
I believe the answer is:
mopeds
'vehicles' is the definition.
(moped is a kind of vehicle)
'clean up a chap's' is the wordplay.
I cannot quite see how this works, but
'clean' could be 'mop' (mopping is a kind of cleaning) and 'mop' is present in the answer.
'chap's' could be 'eds' (short for edward) and 'eds' is found within the answer.
No letters remain.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for mopeds that I've seen before include "Lightweight motorcycles" , "Low-powered motorbike" , "Light motor cycles" , "Low-powered motorbikes" , "bikes" .)