Sea eagles (4)
'sea eagles' is the definition.
(ern is a kind of sea eagle)
This is all the clue.
(Another definition for erns that I've seen is " make gains as before".)
'sea eagles' is the definition.
(erne is a kind of sea eagle)
This is the entire clue.
(Other definitions for ernes that I've seen before include "They fly across the sea" , "Certain birds" , "Sea-eagles" , "sea eagles" , "Irish lough's" .)