Confidence in financial institution (5)

I believe the answer is:

trust

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'confidence' is the definition.
(I know that confidence can be written as trust)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for trust that I've seen before include "Hope, expect" , "Unit of NHS organisation" , "Believe" , "Have faith in, regard as reliable" , "Rely on" .)

I've seen this clue in The Mirror.

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