Crossword Genius

Something neglected in old assignment (8)

Ross

I believe the answer is:

omission

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'something neglected' is the definition.
I can't judge whether this definition defines the answer.

'old assignment' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'assignment' becomes 'mission' (mission is a kind of assignment).
'o'+'mission'='OMISSION'

'in' is the link.

Can you help me to learn more?

(Other definitions for omission that I've seen before include "cut?" , "task not done" , "A thing left out" , "Something lacking" , "Act of leaving out" .)

I've seen this clue in The Hindu.
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