Wanting a drink (5)
I believe the answer is:
short
I believe this clue is a double definition.
'wanting' is the first definition.
(I've seen this before)
'a drink' is the second definition.
(Other definitions for short that I've seen before include "Of small length" , "Terse; in insufficient supply" , "Uncivil, brief film" , "Concise" , "Not long enough" .)