Crossword Genius

Band will repair the damage (9)

Ross

I believe the answer is:

I'm a little stuck... Click here to teach me more about this clue!

'band will' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'repair the damage' is the wordplay.
'repair' indicates an anagram.
'the'+'damage'='thedamage'
'thedamage' is an anagram of 'MEGADEATH'.

Can you help me to learn more?

(Other definitions for megadeath that I've seen before include "end of civilisation", "Huge human tragedy".)