1 down. From start to finish. 3-2-3 letters.
2 down. Punch or Pinocchio? 6 letters.
3 down. Small dome. 6 letters.
4 down. Computer programming language – densely populated island. 4 letters.
6 down. School prizegiving event. 6 letters and 3 letters.
7 down. 1929 Hitchcock film. 9 letters.
12 down. It’s not part of a healthy diet. 4 letters and 4 letters.
14 down. Something to rally the troops. 3 letters and 3 letters.
15 down. Tomato or picker? 6 letters.
17 down. Squander (money). 4 letters.