Neglect circular undertaking (8)

I believe the answer is:

omission

'neglect' is the definition.
(I know that omission is a type of neglect)

'circular undertaking' is the wordplay.
'circular' becomes 'o' (I've seen this in other clues).
'undertaking' becomes 'mission' (I've seen this in other clues).
'o'+'mission'='OMISSION'

(Other definitions for omission that I've seen before include "Mistake resulting from neglect" , "Something left out or forgotten" , "Leaving-out, oversight" , "Lack" , "Oversight, piece of work neglected" .)

I've seen this clue in the Sydney Morning Herald.

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