Capital from independent firms invested in Northern Ireland and America (7)
I believe the answer is:
nicosia
'capital' is the definition.
(capital of Cyprus)
'independent firms invested in northern ireland and america' is the wordplay.
'independent firms' becomes 'cosi' (I can't justify this - if you can you should give a lot more credence to this answer).
'invested in' means one lot of letters goes inside another.
'northern ireland' becomes 'NI' (abbreviation).
'and' means one lot of letters go next to another.
'america' becomes 'a' (common abbreviation eg in USA).
'ni'+'a'='nia'
'cosi' going inside 'nia' is 'NICOSIA'.
'from' is the link.
Can you help me to learn more?
(Other definitions for nicosia that I've seen before include "Largest city on Cyprus" , "Casino I find in Cyprus - that's capital" , "It's capital in Cyprus (7)" , "Casino I visit in Cyprus" , "Casino I used in Cyprus" .)