Crossword Genius

Horror doesn’t start with online slip (5)

Ross

I believe the answer is:

error

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'slip' is the definition.
(slip can mean an error or mistake)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for error that I've seen before include "Faux pas" , "Solecism" , "Slip, mistake" , "Slip-up" , "Trial and ___" .)

I've seen this clue in The Mirror.
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