Drink put on ice keeps (5)
I believe the answer is:
tonic
'drink' is the definition.
(tonic is a kind of drink)
'put on ice keeps' is the wordplay.
'keeps' indicates the answer is hidden within the clue.
'TONIC' is hidden within 'put on ice'.
(Other definitions for tonic that I've seen before include "that may be mixed with gin" , "Stimulant" , "Stimulus" , "An enlivener" , "Carbonated mixer" .)