Abstaining from alcohol (8)
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I believe the answer is:
teetotal
'abstaining from alcohol' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for teetotal that I've seen before include "Abjuring alcohol" , "Abstaining completely from alcohol" , "Never drinking alcohol" , "not taking a drop" , "Sworn off alcohol" .)