Crossword Genius

The Peter Principle states that people within a hierarchy will rise to a level of their own ____ (12)

Ross

I believe the answer is:

incompetence

(Other definitions for incompetence that I've seen before include "Inability to act skilfully" , "Inability to do things properly" , "Lack of ability" , "shows lack of skill" , "Lacking skill and ability" .)

I've seen this clue in The Times and The Sunday Times.
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