Promote hot drink, on the way back (4)
I believe the answer is:
push
'promote' is the definition.
(I know that promote can be written as push)
'hot drink on the way back' is the wordplay.
'hot' becomes 'h' (abbreviation eg on taps).
'drink' becomes 'sup' (to sup is to drink).
'on the way back' says the letters should be written backwards.
'h'+'sup'='hsup'
'hsup' reversed gives 'PUSH'.
(Other definitions for push that I've seen before include "Opposite of pull" , "See 8" , "Offensive - press" , "Try to sell" , "Propel forwards" .)