Punter, not abstaining, may get it (4)
I believe the answer is:
beer
'punter not abstaining' is the definition.
I can't tell whether this defines the answer.
'may get it' is the wordplay.
'may' becomes 'ber' (I can't justify this - if you can you should give a lot more credence to this answer).
'get' indicates putting letters inside.
'it' becomes 'e' ('e' can mean 'electronic' which is similar to 'IT').
'ber' going around 'e' is 'BEER'.
(Other definitions for beer that I've seen before include "Fermented alcoholic drink" , "Malt liquor" , "Perhaps bitter" , "Ale, lager etc" , "eg Bitter" .)