Business associate making a part owner cry out! (7)
I believe the answer is:
partner
'business associate' is the definition.
(business partner)
'a part owner cry out' is the wordplay.
'owner cry out' becomes 'ner' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'part'+'ner'='PARTNER'
'making' acts as a link.
Can you help me to learn more?
(Other definitions for partner that I've seen before include "Associate, in business or private life" , "Consort" , "Business colleague" , "One sharing home or business" , "Either member of a couple" .)