Neglect? Ring embassy (8)
I believe the answer is:
omission
'neglect?' is the definition.
(thesaurus)
'ring embassy' is the wordplay.
'ring' becomes 'o'.
'embassy' becomes 'mission' (I've seen this before).
'o'+'mission'='OMISSION'
(Other definitions for omission that I've seen before include "task not done" , "lapse" , "A thing left out" , "Exclusion" , "Something left out or forgotten" .)