Shocking, American's scorn undermining male in support group (7)
I believe the answer is:
amazing
'shocking' is the definition.
(thesaurus)
'american's scorn undermining male in support group' is the wordplay.
'american's scorn' becomes 'zing' (I am not sure about this - if you are sure you should believe this answer much more).
'undermining' is a charade indicator (letters next to each other).
'male' becomes 'm' (common abbreviation).
'in' means one lot of letters goes inside another.
'support group' becomes 'aa' (Alcoholics Anonymous).
'm' inserted within 'aa' is 'ama'.
'zing' after 'ama' is 'AMAZING'.
Can you help me to learn more?
(Other definitions for amazing that I've seen before include "Astonishing, awesome" , "Stunning, surprising" , "Unbelievable!" , "Astonishing, remarkable" , "Gobsmackingly great!" .)