Ring the embassy - something's been left out (8)
I believe the answer is:
omission
'something's been left out' is the definition.
I can't judge whether this definition defines the answer.
'ring the embassy' is the wordplay.
'ring' becomes 'O' (letter resembling a ring).
'the embassy' becomes 'mission' (I've seen this before).
'o'+'mission'='OMISSION'
Can you help me to learn more?
(Other definitions for omission that I've seen before include "cut?" , "It may create space" , "Lack" , "Mistake resulting from neglect" , "Something lacking" .)