Flavoursome addition to food — and booze! (5)
I believe the answer is:
sauce
I believe this is a double definition.
'flavoursome addition to food' is the first definition.
(sauce is put on food)
'booze' is the second definition.
(both can informally mean alcohol)
'and' is the link.
(Other definitions for sauce that I've seen before include "Condiment - impertinence" , "Cheek; condiment" , "Lip; foodstuff" , "It's good for the goose and gander" , "Meat dressing" .)