Long-winged sea eagle (4)
I believe the answer is:
erne
'long-winged sea eagle' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for erne that I've seen before include "Irish river - sea eagle" , "Sea bird: lough in Ulster" , "Irish river, loughs; sea bird" , "Eagle, river and lough" , "one that catches fish?" .)