In credit, in a roundabout way (8)

I believe the answer is:

indirect

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'in a roundabout way' is the definition.
I can't judge whether this defines the answer.

'in credit' is the wordplay.
'credit' becomes 'direct' (I can't explain this - if you can you should believe this answer much more).
'in'+'direct'='INDIRECT'

Can you help me to learn more?

(Other definitions for indirect that I've seen before include "Neither straight or straightforward" , "Not following the shortest way" , "Circumlocutory" , "Not straighforward" , "Circuitous, oblique" .)

I've seen this clue in the Evening Standard.

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