Vehicle coming from Ayr rolled over (5)
I believe the answer is:
lorry
'vehicle' is the definition.
(lorry is a kind of vehicle)
'coming from ayr rolled over' is the wordplay.
'coming from' says the answer is hidden in the clue.
'over' says the letters should be written in reverse.
'yrrol' can be found hidden inside 'ayr rolled'.
'yrrol' reversed gives 'LORRY'.
(Other definitions for lorry that I've seen before include "Load-carrying vehicle" , "Commercial vehicle" , "HGV" , "Heavy goods vehicle" , "Transport vehicle" .)