Dainty drink (3)
I believe the answer is:
sip
'dainty drink' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sip that I've seen before include "Take small mouthfuls of (drink)" , "Drink, small mouthful" , "Small mouthful of fluid" , "Small mouthful of liquid" , "Drink gingerly" .)