Necessitates a silent revolution (7)
I believe the answer is:
entails
'necessitates' is the definition.
(entailing is a kind of necessitating)
'a silent revolution' is the wordplay.
'revolution' is an anagram indicator.
'a'+'silent'='asilent'
'asilent' with letters rearranged gives 'ENTAILS'.
(Other definitions for entails that I've seen before include "Has as a direct consequence" , "Necessitates" , "limits of will" , "Involves, makes necessary" , "Has as a logical consequence" .)