Readjusted to show zip (OED) (6)
I believe the answer is:
zeroed
'readjusted to show zip' is the definition.
(adjusted something to read zero or 'zip')
I can't explain the remainder of the clue.
(Another definition for zeroed that I've seen is " Adjusted instrument to show OOOs".)
I've seen this clue in The Guardian.
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