It's so quietly offered for the sake of peace (3)
I believe the answer is:
sop
'offered for the sake of peace' is the definition.
I can't judge whether this definition defines the answer.
'it's so quietly' is the wordplay.
'quietly' becomes 'p' (p for piano and quiet).
'so'+'p'='SOP'
Can you help me to learn more?
(Other definitions for sop that I've seen before include "Propitiatory offering" , "A concession or bribe, once offered to Cerberus" , "Propitiatory gift" , "Concession given to mollify or placate" , "Concession made to pacify troublesome person" .)