Use garter to strangle (8)
I believe the answer is:
garrotte
'strangle' is the definition.
(garrotting is a kind of strangling)
'use garter to' is the wordplay.
'use' is an anagram indicator.
'garter'+'to'='garterto'
'garterto' anagrammed gives 'GARROTTE'.
(Other definitions for garrotte that I've seen before include "Execute or kill by strangulation with wire around neck" , "Instrument of execution by strangulation" , "Apparatus for execution by strangulation" , "weapon" , "Strangle with wire/cord" .)