Disagreeable sound ringing gong (7)
I believe the answer is:
noisome
'disagreeable' is the definition.
(I've seen this before)
'sound ringing gong' is the wordplay.
'sound' becomes 'noise' (noising is a kind of sounding**).
'ringing' means one lot of letters goes inside another.
'gong' becomes 'om' (Order of Merit, an award or gong).
'noise' going around 'om' is 'NOISOME'.
(Other definitions for noisome that I've seen before include "Foul-smelling - semi-Ono (anag)" , "Extremely unpleasant" , "Obnoxious" , "Harmful - offensive" , "Disagreeable, unpleasant" .)