Cut off a limb (8)
I believe the answer is:
amputate
'cut off a limb' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for amputate that I've seen before include "Surgically remove all or part of limb" , "Sever" , "In theatre, remove" , "Cut off (a limb)" , "Maybe disarm" .)