Crossword Genius

An error in the field (4)

Ross

I believe the answer is:

slip

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'an error' is the definition.
(I know that slip is a type of error)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for slip that I've seen before include "Lose footing as on banana skin" , "Cutting" , "printer's proof" , "Drop" , "Error; lose one's footing" .)

I've seen this clue in The Irish News.
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