The man's muffling noise facing good thrashings (7)
I believe the answer is:
hidings
'thrashings' is the definition.
'the man's muffling noise facing good' is the wordplay.
'the man's' becomes 'his' (I've seen this before).
'muffling' is an insertion indicator.
'noise facing good' becomes 'ding' (I am not sure about this - if you are sure you should believe this answer much more).
'his' placed around 'ding' is 'HIDINGS'.
Can you help me to learn more?
(Other definitions for hidings that I've seen before include "Beatings" , "concealed?" .)