Don't drink (8)
I believe the answer is:
teetotal
'don't drink' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for teetotal that I've seen before include "Not touching a drop" , "Abstemious" , "not taking a drop" , "Abstention from alcoholic drink" , "Pledged to abstain from alcohol" .)