12 January - Solution for the last clue and the next cryptic crossword clue

Scene of fighting that's on river forming country's border (8)
Solution – frontier

Scene of fighting = front (as in, all quiet on the western front)

That's = ie (the abbreviation)

River = r

Front + ie + r = frontier – which is a word that can be used to describe the border of a country.

Today’s cryptic crossword clue – solution tomorrow

Note making one irritable? Not quite (8)
Source of clue – NZ Herald

Hint – this is a deletion clue – see the cryptic clue type sidebar to check out what that means!