Quietness (4)
'quietness' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for silence that I've seen before include "Gag" , "Soundlessness" , "There's nothing heard" , "Quietness" , "Nothing said" .)
'quietness' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for hush that I've seen before include "Quieten" , "Make (someone) quiet" , "Noiselessness" , "Call for silence" , "(Call for) quiet" .)