American whisky takes the biscuit (7)
I believe the answer is:
bourbon
This clue 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' is the link.
(Other definitions for bourbon that I've seen before include "Corn whiskey" , "Maize whiskey" , "Whiskey - biscuit" , "10" , "American whisky; biscuit" .)