Crossword Genius

Another net trapping seabird (4)

Ross

I believe the answer is:

erne

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

'seabird' is the definition.
(I've seen this in another clue)

'another net trapping' is the wordplay.
'ERNE' is hidden in amongst the letters.
But, I am uncertain how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for erne that I've seen before include "European sea eagle" , "Lough of the North" , "Sea-eagle in an Irish lake" , "Island-studded lake in Fermanagh" , "Irish river, loughs; sea bird" .)

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