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' means one lot of letters go next to another.
'male' becomes 'm' (common abbreviation).
'in' indicates putting letters inside.
'support group' becomes 'aa' (Alcoholics Anonymous).
'm' inserted into '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!" .)