This often protected quiet (4)
I believe the answer is:
soft
'quiet' is the definition.
(similar in meaning)
'this often protected' is the wordplay.
'protected' indicates a hidden word (hidden letters are protected).
'SOFT' can be found hidden inside 'this often'.
(Other definitions for soft that I've seen before include "Cushy, not tough" , "Malleable, light" , "Cushioned" , "(Of drink) not alcoholic" , "Easy to mould or cut" .)