Using megaphone, rouses recruits, being quite demanding (7)

I believe the answer is:

onerous

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

'demanding' is the definition.
(onerous means difficult or demanding)

'using megaphone rouses recruits being quite' is the wordplay.
'ONEROUS' is hidden in amongst the letters.
But, I am uncertain how this is indicated.

Can you help me to learn more?

(Other definitions for onerous that I've seen before include "quite a burden if so" , "Heavy, difficult to do or bear" , "Burdensome, taxing" , "Challenging" , "Oppressive, difficult to bear" .)

I've seen this clue in The Irish Times.

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