These seabirds you might catch with nets? (5)
I believe the answer is:
ernes
'these seabirds' is the definition.
(erne can mean a sea eagle)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for ernes that I've seen before include "Certain birds" , "sea eagles" , "They fly across the sea" , "Irish lough's" , "Sea-eagles" .)