Remove from duty (6)
I believe the answer is:
excise
I believe this clue is a double definition.
'remove' is the first definition.
(I've seen this before)
'duty' is the second definition.
(I've seen this in other clues)
'from' is the link.
(Other definitions for excise that I've seen before include "Customs" , "Expunge the tax?" , "Duty; cut out" , "Cut out; commodity tax" , "that wretches hatefully collect" .)