Separate taste, as some wines drunk (6)
I believe the answer is:
bisect
'separate' is the definition.
(to bisect is to split into two parts)
'taste as some wines drunk' is the wordplay.
'taste' becomes 'bit' (bit is a kind of taste).
'as some wines' becomes 'sec' (some wines are described as sec, ie dry).
'drunk' indicates putting letters inside (inserted letters are drunk in).
'bit' enclosing 'sec' is 'BISECT'.
(Other definitions for bisect that I've seen before include "create schism?" , "Cut in half" , "Cut or divide in two" , "Cut in two equal parts" , "Cut twenty [IN TWO]" .)