Turn, using silent implement (7)
I believe the answer is:
utensil
'implement' is the definition.
(I know that utensil is a type of implement)
'turn using silent' is the wordplay.
'turn' becomes 'u' (a 'U-turn' is a kind of turn).
'using' indicates an anagram (the letters used in a different way).
'silent' is an anagram of 'tensil'.
'u'+'tensil'='UTENSIL'
(Other definitions for utensil that I've seen before include "A container for kitchen use" , "vessel" , "knife, maybe" , "Let us in (anag) -- implement" , "Implement, maybe in kitchen" .)