Strain within small company to get capital (5)
I believe the answer is:
Here is my best explanation:
'capital' is the definition.
(Cairo is an example)
'strain within small company' is the wordplay.
'strain' becomes 'air' ('air' can be a synonym of 'strain').
'within' indicates putting letters inside.
'small company' becomes 'co' (**).
'air' going within 'co' is 'CAIRO'.
'to get' is the link.
(Other definitions for cairo that I've seen before include "Al Qahira", "Egyptian capital", "Egypt's capital", "Port upstream from the Nile delta", "Capital city on the Nile", "African city", "capital city", "Capital of Egypt", "North African capital" and "City near the Nile delta".)