Nag, nag, nag (5)
(Other definitions for ride that I've seen before include "Take a trip" , "Journey as passenger" , "Fairground attraction; go on horseback" , "spin > lift > pedal" , "Travel by horse, bus, etc" .)
'nag nag nag' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for cavil that I've seen before include "Make petty objections" , "Minor complaint" , "Make trivial objection" , "Complain" , "Raise petty objections" .)