I’m supporting exercises, right? Wrong (8)
I believe the answer is:
improper
'wrong' is the definition.
(similar in meaning)
'i'm supporting exercises right?' is the wordplay.
'supporting' becomes 'pro' (being pro something is supporting it).
'exercises' becomes 'pe' (Physical Education class).
'right?' becomes 'r' (common abbreviation).
'im'+'pro'+'pe'+'r'='IMPROPER'
(Other definitions for improper that I've seen before include "Inappropriate" , "Unfitting, out of place" , "Not decorous or seemly" , "Unseemly, indelicate" , "Indecent, unseemly" .)