Crossword Genius

Finding fault is vital (8)

Ross

I believe the answer is:

critical

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'finding fault' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

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(Other definitions for critical that I've seen before include "Extremely ill, near death" , "Finding faults" , "expressing disapproving comments" , "giving literary analysis" , "essential" .)

I've seen this clue in The Sun and The Independent.
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