Execute by strangulation (8)
I believe the answer is:
garrotte
'execute by strangulation' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for garrotte that I've seen before include "Apparatus for execution by strangulation" , "Instrument of execution by strangulation" , "Spanish killer" , "Apply throttle" , "Strangle with wire/cord" .)