Crossword Genius

He infiltrated the mob, metamorphosing into a monster (8)

Ross

I believe the answer is:

behemoth

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

'a monster' is the definition.
(I know that monster can be written as behemoth)

'he infiltrated the mob metamorphosing' is the wordplay.
I cannot quite see how this works, but
'he' could be 'em' and 'em' is located in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found in the answer.
This explanation may well be incorrect...

'into' acts as a link.

Can you help me to learn more?

(Other definitions for behemoth that I've seen before include "Giant" , "Anything abnormally large and powerful" , "Monstrous beast, or thing" , "Big corporation" , "Abnormally large creature" .)

I've seen this clue in the Sydney Morning Herald.
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