Rollercoaster, eg (4)
I believe the answer is:
ride
'rollercoaster eg' is the definition.
(I know that roller coaster is a type of ride)
This is the entire clue.
(Other definitions for ride that I've seen before include "Travel on the back of animal" , "What suckers are taken for" , "Travel, by horse say" , "Lie at anchor" , "spin > lift > pedal" .)