Queen and wizard involved in extra destructive event (10)
I believe the answer is:
armageddon
'destructive event' is the definition.
The definition suggests a singular noun which matches the answer.
'queen and wizard involved in extra' is the wordplay.
'queen' becomes 'r' (abbreviation for regina, e.g. in ER ).
'and' says to put letters next to each other.
'wizard' becomes 'mage' (mage can mean a wizard or magician).
'involved in' means one lot of letters goes inside another.
'extra' becomes 'addon' (I've seen this before).
'r'+'mage'='rmage'
'rmage' put within 'addon' is 'ARMAGEDDON'.
Can you help me to learn more?
(Other definitions for armageddon that I've seen before include "final engagement" , "battle missed" , "Terrible war" , "bloody battle" , "large-scale conflict" .)