Subject to EU articles (5)
I believe the answer is:
under
'subject to' is the definition.
(being subject to a law is being under it)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for under that I've seen before include "Dylan Thomas wrote '. . . . . Milk Wood'" , "Anaesthetised" , "Governed by" , "Dylan Thomas radio play ''.... Milk Wood''" , "Being short" .)