Return on investment connected with tense concession rises later (9)
I believe the answer is:
posterior
'later' is the definition.
(I've seen this in another clue)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for posterior that I've seen before include "Further back; bottom" , "Backside" , "later" , "Stern" , "Hindquarters" .)