Perhaps business of ripper hasn’t changed (11)

I believe the answer is:
partnership
'perhaps business' is the definition.
'partnership' can be an answer for 'business' (I have seen 'Professional business ' mean 'partnership' so perhaps 'business' could also mean 'partnership'). I'm not certain of the 'perhaps' bit.
'ripper hasn't changed' is the wordplay.
'changed' is an anagram indicator.
'ripper'+'hasnt'='ripperhasnt'
'ripperhasnt' anagrammed gives 'PARTNERSHIP'.
'of' is the link.
Can you help me to learn more?
(Other definitions for partnership that I've seen before include "Alliance" , "Association of two or more persons" , "Collaboration" , "Association of two or more people" , "Professional business" .)
