An hour-long ride in somebody else’s car (5)
I believe the answer is:
hitch
'ride in somebody else's car' is the definition.
I can't tell whether this definition defines the answer.
'an hour-long' is the wordplay.
'an hour' becomes 'h' (abbreviation).
'long' becomes 'itch' (to long or itch for something is to desire it).
'h'+'itch'='HITCH'
Can you help me to learn more?
(Other definitions for hitch that I've seen before include "couple" , "To travel without paying" , "Small problem" , "Pull up" , "Unexpected problem" .)