Drinker's toast (6)
I believe the answer is:
cheers
'drinker's toast' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for cheers that I've seen before include "Heartens with hurrahs" , "Shouts of praise" , "Ta; gives comfort to" , "Accolade" , "Thanks; your health" .)