1 down. Opening contests. 5 letters.
2 down. Less dense – firestarter. 7 letters.
3 down. <i>___ Your Enthusiasm</i>. 4 letters.
4 down. In two shakes of a lamb’s tail. 8 letters.
5 down. Consumed. 5 letters.
6 down. In the presence of – or beef (anag).
6 letters.
11 down. e.g. Barbara Hepworth. 8 letters.
12 down. In the land of Nod. 6 letters.
13 down. U, as in ____. 7 letters.
15 down. Know them before you start. 5 letters.
17 down. Gung-ho. 5 letters.
18 down. Kind of clue – blue – feathers. 4 letters.