Last solution

Across: 1 Trepidation; 9 Niggard; 10 Often; 11 Exert; 12 Collate; 13 Induce; 15 Adhere; 18 Assegai; 20 Amass; 22 Class; 23 Barrier; 24 Endorsement.

Down: 2 Rogue; 3 Plastic; 4 Deduct; 5 Troll; 6 Outrage; 7 Inheritance; 8 Unnecessary; 14 Disdain; 16 Diagram; 17 Nimbus; 19 Gusto; 21 Alien.