Some alcohol is wrong, not right (3)
I believe the answer is:
tot
'some alcohol' is the definition.
(tot can mean a small drink of alcohol)
'wrong not right' is the wordplay.
'wrong' becomes 'tort' (a civil wrong in law).
'not' indicates named letters should be taken away.
'right' becomes 'r' (common abbreviation).
'tort' with 'r' taken out is 'TOT'.
'is' acts as a link.
(Other definitions for tot that I've seen before include "Add the little child?" , "Arithmetic for infant" , "Child; measure of spirits" , "Party drink" , "Youngster; short drink" .)