News agency awfully sure about shortened name (7)
I believe the answer is:
reuters
'news agency' is the definition.
(I've seen this in another clue)
'awfully sure about shortened name' is the wordplay.
'awfully' indicates an anagram.
'about' is an insertion indicator.
'shortened name' becomes 'ter' (I can't justify this - if you can you should believe this answer much more).
'sure' with letters rearranged gives 'reus'.
'reus' enclosing 'ter' is 'REUTERS'.
Can you help me to learn more?
(Other definitions for reuters that I've seen before include "International news agency" , "up-to-date agency" , "Noted news agency" .)