Strangle in silence (8)
I believe the answer is:
throttle
I believe this clue is a double definition.
'strangle' is the first definition.
(I know that strangle can be written as throttle)
'silence' is the second definition.
(thesaurus)
'in' acts as a link.
(Other definitions for throttle that I've seen before include "what regulates flow of juice?" , "Fuel-regulating valve in an engine" , "Strangle; fuel controller" , "Strangle the fuel valve" , "Choke by pressure on the windpipe" .)