Whiskey or a biscuit (7)
I believe the answer is:
bourbon
This clue is a double definition.
'whiskey' is the first definition.
(bourbon is a type of whiskey)
'a biscuit' is the second definition.
(I've seen this before)
(Other definitions for bourbon that I've seen before include "American whiskey - French royal house" , "10" , "Biscuit -- alcohol" , "Maize whiskey" , "Whiskey - biscuit" .)