Crossword Genius

Failing, change sides (6)

Ross

I believe the answer is:

defect

I believe this clue is a double definition.

'failing' is the first definition.
(thesaurus)

'change sides' is the second definition.
(thesaurus)

(Other definitions for defect that I've seen before include "Deficiency" , "Desert - fault" , "weakness" , "Desert - flaw" , "bug" .)

I've seen this clue in The Times.
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