The Roman's conqueror (4)

I believe the answer is:

hero

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

'conqueror' is the definition.
(I've seen this before)

'the roman's' is the wordplay.
'HERO' is hidden within the letters.
But, I am not sure how this is indicated.

Can you help me to learn more?

(Other definitions for hero that I've seen before include "Idol" , "Star" , "Leander's suitor" , "Lion" , "Male protagonist" .)

I've seen this clue in The Mirror.

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