Ring embassy revealing oversight (8)

I believe the answer is:

omission

'oversight' is the definition.
(omission is a kind of oversight)

'ring embassy' is the wordplay.
'ring' becomes 'o'.
'embassy' becomes 'mission' (I've seen this before).
'o'+'mission'='OMISSION'

'revealing' is the link.

(Other definitions for omission that I've seen before include "type of sin" , "Exclusion" , "lapse" , "Something left out or neglected" , "Something left out or not done" .)

I've seen this clue in The Telegraph and The Guardian.

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