Result of huge explosion, rubble can spread round area (4,6)
I believe the answer is:
crab nebula
'result of huge explosion' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'rubble can spread round area' is the wordplay.
'spread' indicates anagramming the letters.
'round' is an insertion indicator.
'area' becomes 'a' (maths abbreviation).
'rubble'+'can'='rubblecan'
'rubblecan' is an anagram of 'crbnebula'.
'crbnebula' enclosing 'a' is 'CRAB NEBULA'.
Can you help me to learn more?
(Another definition for crab nebula that I've seen is " vision in sky".)