Closing the surveillance outlet is a news item (5)
I believe the answer is:
event
'a news item' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'closing the surveillance outlet' is the wordplay.
'closing the surveillance' becomes 'e' (I can't explain this - if you can you should give a lot more credence to this answer).
'outlet' becomes 'vent' (I've seen this before).
'e'+'vent'='EVENT'
'is' is the link.
Can you help me to learn more?
(Other definitions for event that I've seen before include "case" , "Happening, incident" , "Occurence, happening" , "'Occurrence, occasion (5)'" , "match" .)