Resonant scheme supported by man (8)
I believe the answer is:
plangent
'resonant' is the definition.
(I've seen this before)
'scheme supported by man' is the wordplay.
'scheme' becomes 'plan' (I've seen this before).
'supported by' is a charade indicator (letters next to each other) (in a down clue, some letters hold up others).
'man' becomes 'gent' (gent is a kind of man).
'plan'+'gent'='PLANGENT'
(Other definitions for plangent that I've seen before include "(Of sound) mournfully resonant" , "Clangorous" , "Resonant, reverberating with mournful sound" , "Of sounds, resonant and reverberating" , "loud noise" .)