Crossword Genius

Demoniac exerted power endlessly with university representatives (9)

Ross

I believe the answer is:

energumen

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

'demoniac' is the definition.
(thesaurus)

'exerted power endlessly with university representatives' is the wordplay.
I cannot quite understand how this works, but
'university' could be 'u' (abbreviation for university) and 'u' is found within the answer.
'representatives' could be 'gmen' (G-man is an example) and 'gmen' is found within the leftover letters.
This explanation may well be incorrect...

Can you help me to learn more?

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