American whisky takes the biscuit (7)
I believe the answer is:
bourbon
I believe this is a double definition.
'american whisky' is the first definition.
(I've seen this before)
'the biscuit' is the second definition.
(I've seen this before)
'takes' acts as a link.
(Other definitions for bourbon that I've seen before include "Corn whiskey" , "Maize whiskey" , "Whiskey - biscuit" , "10" , "American whisky; biscuit" .)