Band like quiet covers (4)
I believe the answer is:
sash
'band' is the definition.
(sash is a kind of band)
'like quiet covers' is the wordplay.
'like' becomes 'as'.
'quiet' becomes 'sh'.
'covers' means one lot of letters goes inside another.
'as' placed within 'sh' is 'SASH'.
(Other definitions for sash that I've seen before include "Band of cloth" , "Baldrick" , "Window frame; silk band" , "Framework holding window panes" , "Style of window" .)