Quiet time for a bellboy (4)
I believe the answer is:
page
'a bellboy' is the definition.
(thesaurus)
'quiet time' is the wordplay.
'quiet' becomes 'p' (music symbol for 'piano', ie soft or quiet).
'time' becomes 'age' (an age is a period of time).
'p'+'age'='PAGE'
'for' acts as a link.
(Other definitions for page that I've seen before include "Boy at wedding" , "Young hotel employee" , "Young male attendant" , "Messenger" , "Piece of paper for a young attendant" .)