Sweet drink accompanying spread (12)
I believe the answer is:
butterscotch
'sweet drink accompanying spread' is the definition.
I can't tell whether this defines the answer.
'sweet drink accompanying spread' is the wordplay.
'sweet drink' becomes 'scotch' (Scotch is an example. I am not sure about the 'sweet' bit.**).
'accompanying' means one lot of letters go next to another.
'spread' becomes 'butter' (I've seen this before).
'scotch' put after 'butter' is 'BUTTERSCOTCH'.
(Other definitions for butterscotch that I've seen before include "Brittle, yellow-brown sweet" , "confectionery" , "Type of toffee" , "Hard brittle toffee" , "Kind of toffee" .)