Crossword Genius

Change sides by mistake (6)

Ross

I believe the answer is:

defect

I believe this clue is a double definition.

'change sides' is the first definition.
(I've seen this before)

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

'by' acts as a link.

(Other definitions for defect that I've seen before include "To change sides dishonourably" , "Flaw - change sides" , "Go over to the enemy - it's a flaw" , "Leave the country" , "Deficiency" .)

I've seen this clue in The Mirror and The Daily Express.
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