You might have to pay for this confession (9)

I believe the answer is:

admission

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'confession' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

(Other definitions for admission that I've seen before include "Right to enter" , "Acknowledgment of the truth of something" , "acceptance" , "concession" , "Permission to enter" .)

I've seen this clue in The Times.

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