Crossword Genius

Pester with unoriginal public address (5)

Ross

I believe the answer is:

annoy

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'pester' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

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(Other definitions for annoy that I've seen before include "trouble" , "Anger" , "be a nuisance" , "Bother, irritate" , "hack off" .)

I've seen this clue in the Sydney Morning Herald.
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