Look into business making capital (5)
I believe the answer is:
cairo
'capital' is the definition.
(capital of Egypt)
'look into business' is the wordplay.
'look' becomes 'air' (something might have a certain air or look).
'into' means one lot of letters goes inside another.
'business' becomes 'co' (short for company).
'air' placed inside 'co' is 'CAIRO'.
'making' acts as a link.
(Other definitions for cairo that I've seen before include "Capital of Egypt" , "Al Qahira" , "City near the Nile delta" , "Capital city on the Nile" , "African city" .)