Revelation of artillery (9)
I believe the answer is:
bombshell
This clue might be a double definition.
'revelation' is the first definition.
(thesaurus)
'artillery' is the second definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe there's a link between them I don't understand?
'of' acts as a link.
Can you help me to learn more?
(Other definitions for bombshell that I've seen before include "big disappointment" , "Piece of devastating news" , "Terrible shock" , "That really is surprising" , "attractive blonde" .)