Belief in direct action (6)

I believe the answer is:

credit

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But I can't explain it at all! Could you help me understand?

(Other definitions for credit that I've seen before include "Arrangement for deferred payment" , "Good reputation; tick" , "good character" , "Favourable balance - good repute" , "Believe - one side of an account" .)

I've seen this clue in the Evening Standard.

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