Try small drink (4)
I believe the answer is:
shot
This clue is a double definition.
'try' is the first definition.
(both can mean an attempt)
'small drink' is the second definition.
(I've seen this in another clue)
(Other definitions for shot that I've seen before include "Zoomed" , "Photo; try" , "Darted" , "Lead pellet" , "Small drink; (rocket) launch" .)