The piranha's native country? (4)

I believe the answer is:

iran

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

'country?' is the definition.
(Iran is a country)

'the piranha's native' is the wordplay.
'IRAN' is hidden in amongst the letters.
However, I am not sure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for iran that I've seen before include "Tehran's country" , "Country of western Asia" , "Country to east of Iraq" , "Persia some time ago" , "bombless state" .)

I've seen this clue in the Evening Standard.

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