I am stuck on top right.
4 across. Clue: Suitor in simple argument (9). No letters!
8 down. Clue: Who's for certain ruffled when mobile very loudly goes off? (7,8). I have: ??????? ?I???T?R. Something "MINISTER"?
12 across. Clue: Given, say Sun delivered, good also to get refined Guardian (10). No letters.
Help please.