Two-thirds of Israel is upset about country's eastern border with this nation (5)

I believe the answer is:

syria

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

'nation' is the definition.
(Syria is an example)

I don't understand the remainder of the clue.

(Other definitions for syria that I've seen before include "Arab republic, independent since 1946" , "Middle-East Republic" , "Near eastern country" , "Captain; omit; refuse container" , "Asian country" .)

I've seen this clue in The Independent.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.