Yesterday’s solution

— ACROSS: 1 City fathers. 5 Enjoy. 7 Balsa. 9 Mark out. 11 Sop. 12 USA. 13 Jumps up. 16 Tutor. 17 Ennui. 18 Spelling bee. DOWN: 1 Cheapskates. 2 Foyer. 3 Taboo. 4 Standardise. 6 Jump jet. 8 Let up on. 10 Kip. 14 Mural. 15 Stein.