Crossword Genius

Deficiency or failing (8)

Ross

I believe the answer is:

weakness

I believe this clue is a double definition.

'deficiency' is the first definition.
(thesaurus)

'failing' is the second definition.
(failing can mean a weakness or flaw)

(Other definitions for weakness that I've seen before include "Ill-defended spot - predilection" , "Fault or flaw" , "Lack of strength" , "Failing or shortcoming" , "Achilles heel" .)

I've seen this clue in The Daily Mail and the Sydney Morning Herald.
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