Youngster quietly raised (3)
I believe the answer is:
pup
'youngster' is the definition.
(young dog)
'quietly raised' is the wordplay.
'quietly' becomes 'p' (p for piano and quiet).
'raised' becomes 'up' (similar in meaning).
'p'+'up'='PUP'
(Other definitions for pup that I've seen before include "Young seal" , "Young of canines" , "Young dog as palindrome" , "Youngster" , "Young animal" .)