Not a sound from granny! (4)
I believe the answer is:
knot
'granny' is the definition.
(I've seen this before)
'not a sound' is the wordplay.
'a sound' shows a homophone (sound like).
'not' sounds like 'KNOT'.
'from' is the link.
(Other definitions for knot that I've seen before include "bond, perhaps?" , "Bend - one nautical mile per hour" , "Unit of speed in water" , "Entangle" , "Tie, hitch" .)