Crossword Genius

Goat-men are capable of explosive power! (7)

Ross

I believe the answer is:

megaton

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

'explosive power' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'goat-men are capable' is the wordplay.
'goat-men' can be anagrammed to 'MEGATON'.
Though, I'm unsure how this is indicated.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for megaton that I've seen before include "weight" , "Measure of explosive power - montage (anag)" , "Unit of explosive power" , "Explosive power equivalent to one million tons of TNT" , "Powerful explosive unit" .)

I've seen this clue in the Evening Standard.
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