Strain within small company to get capital (5)
I believe the answer is:
cairo
'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 "Capital of Egypt" , "North African capital" , "Port upstream from the Nile delta" , "Egyptian capital" , "African city" .)