Cut in duty (6)
I believe the answer is:
excise
I believe this clue is a double definition.
'cut' is the first definition.
(I've seen this before)
'duty' is the second definition.
(I've seen this before)
'in' is the link.
(Other definitions for excise that I've seen before include "Tax on certain goods and commodities" , "Expunge the tax?" , "Customs" , "A tax to be cut out, perhaps" , "Duty; cut out" .)