Bass on remodelled moped left centre of Rome with sweetheart (4)
I believe the answer is:
deep
'bass' is the definition.
(I know that bass can be written as deep)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for deep that I've seen before include "Bottomless" , "Main" , "Profound - cunning - sea - bass" , "Sunk low" , "Intense; low (in pitch)" .)