Crossword Genius

Error not pronounced — it's easily undone (4,4)

Ross

I believe the answer is:

slip knot

'it's easily undone' is the definition.
(I know that a slip knot is easily undone)

'error not pronounced' is the wordplay.
'error' becomes 'slip' (slip is a kind of error).
'pronounced' indicates a 'sounds like' (homophone) clue.
'not' is a homophone of 'knot'.
'slip'+'knot'='SLIP-KNOT'

(Other definitions for slip knot that I've seen before include "that's easily undone" , "Something tied but easily undone" , "Granny, say" , "You can see it run along rope" .)

I've seen this clue in The Times.
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