Mole, for example, with bad joint, did you say? (7)

I believe the answer is:

diarist

'mole for example' is the definition.
(Adrian Mole is a fictional diarist)

I can't explain the rest of the clue.

(Other definitions for diarist that I've seen before include "Pepys, for example" , "e.g. John Evelyn" , "chronicler" , "eg Samuel Pepys" , "Pepys or Frank" .)

I've seen this clue in The Guardian.

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