On the way back, hurried one's drink (7)
I believe the answer is:
sidecar
'drink' is the definition.
(sidecar is a kind of drink)
'on the way back hurried one's' is the wordplay.
'on the way back' says the letters should be written in reverse.
'hurried' becomes 'raced' ('race' can be a synonym of 'hurry').
'one's' becomes 'is' (roman numeral).
'raced'+'is'='racedis'
'racedis' reversed gives 'SIDECAR'.
(Other definitions for sidecar that I've seen before include "Tipple" , "Part of combination" , "Motorcycle add-on" , "Cocktail; bike attachment" , "Cocktail - which some motor-cyclists get attached to?" .)