Concerning swindle, company is to check again (9)
I believe the answer is:
reconfirm
'is to check again' is the definition.
(to confirm or check something a second time)
'concerning swindle company' is the wordplay.
'concerning' becomes 're' (both can mean on a particular topic).
'swindle' becomes 'con' (con is a kind of swindle).
'company' becomes 'firm' (firm can mean a company or business).
're'+'con'+'firm'='RECONFIRM'
(Other definitions for reconfirm that I've seen before include "Check over" , "Verify again" .)