Imagined team getting drunk after drive (6)
I believe the answer is:
dreamt
'imagined' is the definition.
(dream up can mean to imagine)
'team getting drunk after drive' is the wordplay.
'getting drunk' indicates an anagram.
'after' says to put letters next to each other.
'drive' becomes 'dr' (abbreviation used in road names).
'team' is an anagram of 'eamt'.
'eamt' after 'dr' is 'DREAMT'.
(Other definitions for dreamt that I've seen before include "Fancied" , "Vainly hoped" , "Fantasised" , "Had mind pictures while asleep" , "had visions" .)