Boycott 'great' retrogressive art by cis male (9)
I believe the answer is:
ostracism
'boycott' is the definition.
(I've seen this before)
'great retrogressive art by cis male' is the wordplay.
'great' becomes 'os' (I can't explain this - if you can you should believe this answer much more).
'retrogressive' says the letters should be written backwards.
'by' says to put letters next to each other.
'male' becomes 'm' (common abbreviation).
'art' in reverse letter order is 'tra'.
'os'+'tra'+'cis'+'m'='OSTRACISM'
Can you help me to learn more?
(Other definitions for ostracism that I've seen before include "Exclusion from a group or society" , "Shunning" , "cold shoulder" , "Rejection" , "Refusal to associate with, exclusion from society" .)