Believe workers' alliance in financial institution (6,5)
I believe the answer is:
credit union
'financial institution' is the definition.
(credit union is a kind of financial institution)
'believe workers' alliance' is the wordplay.
'believe' becomes 'credit' (I've seen this in another clue).
'workers' alliance' becomes 'union' (I've seen this before. I am not sure about the 'workers'' bit.).
'credit'+'union'='CREDIT UNION'
'in' acts as a link.
Can you help me to learn more?
(Another definition for credit union that I've seen is " Cooperative".)