Sever, with "off" (3)
I believe the answer is:
lop
'sever with off' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for lop that I've seen before include "Cut away branches or twigs" , "Cut (e.g. branch off)" , "Prune, cut the top off" , "Cut off, tree branches say" , "Remove branches from a tree" .)