Not conscious one is in error? (3)

I believe the answer is:

out

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'in error?' is the definition.
(I've seen this before)

'not conscious one' is the wordplay.
'not' becomes 'o' (I've seen this in other clues).
'conscious one' becomes 'ut' (I am not sure about this - if you are sure you should believe this answer much more).
'o'+'ut'='OUT'

'is' is the link.

Can you help me to learn more?

(Other definitions for out that I've seen before include "Away; into public domain" , "No longer in prison" , "Possibly caught" , "Inaccurate - dismissed" , "No longer imprisoned" .)

I've seen this clue in The Globe and Mail.

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