Quietly object to a scrap (8)
I believe the answer is:
particle
'to a scrap' is the definition.
(I've seen this before)
'quietly object' is the wordplay.
'quietly' becomes 'p' (musical symbol).
'object' becomes 'article'.
'p'+'article'='PARTICLE'
(Other definitions for particle that I've seen before include "Small bit" , "Small amount" , "Crumb" , "Eg, a proton" , "Molecule" .)