Loud breather chucked away (5)
I believe the answer is:
flung
'chucked away' is the definition.
(fling can mean to chuck away)
'loud breather' is the wordplay.
'loud' becomes 'f' (short for forte - 'loud' in music).
'breather' becomes 'lung' (you breathe with your lungs).
'f'+'lung'='FLUNG'
(Other definitions for flung that I've seen before include "Threw" , "Hurled" , "Thrown with force" , "Cast aside" .)