Bombing announcement of new ruler (6)
I believe the answer is:
nuking
'bombing announcement' is the definition.
'nuking' can be an answer for 'bombing' (nuking is a kind of bombing). I'm not certain of the 'announcement' bit.
'new ruler' is the wordplay.
'new' becomes 'nu' (I can't justify this - if you can you should give a lot more credence to this answer).
'ruler' becomes 'king' (king is a kind of ruler).
'nu'+'king'='NUKING'
'of' is the link.
Can you help me to learn more?
(Other definitions for nuking that I've seen before include "Dropping an A-bomb (onto)" , "warming up" .)