Sweet alcoholic drink taken by bishop, say (12)
I believe the answer is:
butterscotch
'sweet' is the definition.
(butterscotch is a kind of sweet)
'alcoholic drink taken by bishop say' is the wordplay.
'alcoholic drink' becomes 'scotch'.
'taken by' means one lot of letters go next to another.
'bishop' becomes 'b' (abbreviation used in chess).
'say' becomes 'utter' (I've seen this before).
'b'+'utter'='butter'
'scotch' put after 'butter' is 'BUTTERSCOTCH'.
(Other definitions for butterscotch that I've seen before include "Kind of toffee" , "Type of toffee" , "Hard brittle toffee" , "Brittle, yellow-brown sweet" , "confectionery" .)