Lifted mate's drink (3)
I believe the answer is:
lap
'drink' is the definition.
(lap can mean to drink)
'lifted mate's' is the wordplay.
'lifted' says the letters should be written backwards (going up in down clue).
'mate' becomes 'pal' (I've seen this before).
'pal' in reverse letter order is 'LAP'.
(Other definitions for lap that I've seen before include "Use tongue to drink; circuit" , "One circuit of a course" , "place for small computer?" , "Stage - circuit" , "Drink; lick" .)