Bad joints reported by those writing regularly? (8)

I believe the answer is:

diarists

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'those writing regularly?' is the definition.
(people keeping a diary)

I don't understand the remainder of the clue.

(Other definitions for diarists that I've seen before include "People who keep a daily record of their lives" , "Sit raids out with daily record keepers" , "They maintain daily records like Pepys" .)

I've seen this clue in The Times.

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