One must have faith to give credit (7)

I believe the answer is:

believe

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'credit' is the definition.
(I know that believe is a kind of credit)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for believe that I've seen before include "Regard as true" , "Accept as true" , "Trust" , "Hold as true" , "Have confidence in" .)

I've seen this clue in The Globe and Mail and The Irish News.

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