Crossword Genius

Tied in a knot. (That's 'correct') (4)

Ross

I believe the answer is:

edit

'correct' is the definition.
(edit can mean to correct or emend)

'tied in a knot' is the wordplay.
'in a knot' indicates anagramming the letters.
'tied' anagrammed gives 'EDIT'.

'that's' acts as a link.

(Other definitions for edit that I've seen before include "This is an act of cleaning" , "Tide (anag.)" , "Be in charge of (newspaper)" , "Make textual changes" , "Supervise the publication of" .)

I've seen this clue in the Evening Standard.
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