Put together investment -- rum thing generating capital (5,5)
I believe the answer is:
addis ababa
'capital' is the definition.
(capital of Ethiopia)
'put together investment rum thing' is the wordplay.
'put together' becomes 'add' (I've seen this in another clue).
'investment' becomes 'isa' (Individual Savings Account).
'rum thing' becomes 'baba' (I am not sure about this - if you are sure you should believe this answer much more).
'add'+'isa'+'baba'='ADDIS ABABA'
'generating' acts as a link.
Can you help me to learn more?
(Other definitions for addis ababa that I've seen before include "Capital of Ethiopia" , "Ethiopia's capital" , "place in Africa" , "Ethiopian capital" , "Hot city" .)