Quiet period in which set gets a break (8)
I believe the answer is:
playtime
'a break' is the definition.
(I've seen this before)
'quiet period in which set' is the wordplay.
'quiet' becomes 'p' (music symbol for 'piano', ie soft or quiet).
'period' becomes 'time period' (period of time).
'in which' means one lot of letters goes inside another.
'set' becomes 'lay' (both can mean to place something).
'p'+'time'='ptime'
'ptime' going around 'lay' is 'PLAYTIME'.
'gets' is the link.
(Other definitions for playtime that I've seen before include "Recreation period" , "Break in school day" , "Schoolchildren's break" , "Curtain up" , "Period for pleasure" .)