Crossword Genius

Slip between the sheets? (7)

Ross

I believe the answer is:

erratum

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

I cannot understand how the rest of the clue works.

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(Other definitions for erratum that I've seen before include "something wrong?" , "Mistake by Latin scholar" , "Printer's mistake" , "mistake in text" , "Mistake in book, etc" .)

I've seen this clue in The Times.
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