Long ride (4)
'long ride?' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for limo that I've seen before include "Long motor" , "Luxurious car (colloq.)" , "Stretched car (abbr)" , "vehicle" , "Set of rooms" .)
(Other definitions for limousine that I've seen before include "Luxury car" , "Form of transport" , "Large luxurious car" , "Luxurious car (with a chauffeur?)" , "vehicle" .)