Warplane once deployed uranium-enriched device causing great damage (7,6)
I believe the answer is:
nuclear weapon
'device causing great damage' is the definition.
I can't judge whether this defines the answer.
'warplane once deployed uranium-enriched' is the wordplay.
'deployed' indicates an anagram.
'uranium' becomes 'U' (U is the chemical symbol for uranium).
'enriched' means one lot of letters goes inside another.
'warplane'+'once'='warplaneonce'
'warplaneonce' is an anagram of 'nclearweapon'.
'nclearweapon' enclosing 'u' is 'NUCLEAR WEAPON'.
Can you help me to learn more?
(Other definitions for nuclear weapon that I've seen before include "Fission bomb" , "Atomic bomb" .)