No diplomatic representatives in those removed (9)
I believe the answer is:
omissions
'those removed' is the definition.
I can't tell whether this definition defines the answer.
'no diplomatic representatives' is the wordplay.
'no' becomes 'O' (resembles 0 - 'no' can mean 'zero').
'diplomatic representatives' becomes 'missions' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'o'+'missions'='OMISSIONS'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for omissions that I've seen before include "Defaults" , "Have they been left out" , "mistakes" .)