Spirit and beer drunk with grandma's biscuit (11,3)
I believe the answer is:
gingerbread man
'biscuit' is the definition.
(gingerbread man is a kind of biscuit)
'spirit and beer drunk with grandma's' is the wordplay.
'spirit' becomes 'gin' (alcoholic spirit).
'and' means one lot of letters go next to another.
'drunk with' is an anagram indicator.
'beer' mixed up with 'grandma' gives 'gerbreadman'.
'gin'+'gerbreadman'='GINGERBREAD MAN'
(Other definitions for gingerbread man that I've seen before include "Cake in human form" , "Spiced biscuit shaped like a chap" .)