Quietened (6)
'quietened' is the definition.
('hush' can be a synonym of 'quieten')
This is all the clue.
(Other definitions for hushed that I've seen before include "Silent, still" , "Muted" , "Made or became quiet" , "Made silent or quiet" , "Quietened" .)
'quietened' is the definition.
(muting is a kind of quietening)
This is the entire clue.
(Other definitions for muted that I've seen before include "Soft-pedalled" , "Softened (of sound or colour)" , "In music, with sound deadened or muffled" , "Dull" , "In a softened tone" .)