Last solution

Across: 7 Porch; 8 Advance; 9 Launder; 10 Ruing; 12 Instructor; 15 Undercover; 18 Ditto; 19 Thicket; 21 Promise; 22 Circa.

Down: 1 Spellbound; 2 Group; 3 Shed; 4 Garret; 5 Overrule; 6 Anxiety; 11 Gargantuan; 13 Narcotic; 14 Edition; 16 Outset; 17 Skirt; 20 Itch.