Dangerous emission transformed into a raid (9)
I believe the answer is:
radiation
'dangerous emission' is the definition.
'radiation' can be an answer for 'emission' (radiation is a kind of emission). I'm not certain of the 'dangerous' bit.
'transformed into a raid' is the wordplay.
'transformed' indicates anagramming the letters.
'into'+'a'+'raid'='intoaraid'
'intoaraid' with letters rearranged gives 'RADIATION'.
Can you help me to learn more?
(Other definitions for radiation that I've seen before include "Harmful waves" , "given out with mobile phones?" , "Transmission of energy" , "Nuclear emissions" , "Energy emitted by eg the sun" .)