Demanding person from Oldham needing a break? (7)

I believe the answer is:

exactor

I'm a little stuck... Click here to teach me more about this clue!

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

I don't understand the remainder of the clue.

(Other definitions for exactor that I've seen before include "Individual demanding" , "Extortioner" , "One demands" , "Core tax (anag.)" , "Blackmailer" .)

I've seen this clue in The Guardian.

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