Imperious fairy? (4)

I believe the answer is:

peri

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'fairy?' is the definition.
(Persian mythological being)

'imperious' is the wordplay.
'PERI' is hidden in amongst the letters.
However, I'm not sure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for peri that I've seen before include "Fairy queen" , "Old Persian fairy" , "Ripe as a kind of fairy" , "Prefix denoting 'around'" , "Fairy (Pers. mythology)" .)

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