Last solution

Across: 1 Drab; 3 Splinter; 9 Scourge; 10 Trail; 11 Astonishment; 13 Thrive; 15 Adhere; 17 Disreputable; 20 Obese; 21 Isolate; 22 Outlying; 23 Deft.

Down: 1 Distaste; 2 About; 4 Please; 5 Intimidation; 6 Trainee; 7 Rile; 8 Transversely; 12 Vehement; 14 Raiment; 16 Option; 18 Brave; 19 Solo.