Fail to include something so I must be corrected (4,3)

I believe the answer is:

miss out

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'fail to include something' is the definition.
I can't judge whether this defines the answer.

'so i must be corrected' is the wordplay.
'be corrected' is an anagram indicator.
'so'+'i'+'must'='soimust'
'soimust' anagrammed gives 'MISS OUT'.

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(Another definition for miss out that I've seen is " Omit".)

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

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