A bird watcher never hides it (4)

I believe the answer is:

erne

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

'a bird' is the definition.
(erne is a type of bird)

'watcher never hides it' is the wordplay.
'ERNE' is hidden within the letters.
But, I am not sure how this is indicated.

Can you help me to learn more?

(Other definitions for erne that I've seen before include "Flier" , "Lough of the North" , "one that catches fish?" , "A high-flier" , "Irish river, loughs; sea bird" .)

I've seen this clue in The Globe and Mail and The Irish News.

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