Rich oppress our organising (10)
I believe the answer is:
prosperous
'rich' is the definition.
(similar in meaning)
'oppress our organising' is the wordplay.
'organising' is an anagram indicator.
'oppress'+'our'='oppressour'
'oppressour' is an anagram of 'PROSPEROUS'.
(Other definitions for prosperous that I've seen before include "Affluent" , "Wealthy" , "Rich" , "Doing well" , "thriving" .)