SOLUTION 681:

ACROSS 1 Risotto, 4 Rodin, 7 Coxa, 8 Pendulum, 10 Portsmouth, 12 Wyvern,

13 Sweets, 15 Uncle Remus, 18 Landmine, 19 Wing, 20 Sitar, 21 Spenser. DOWN 1 Recap, 2 Sex drive, 3 Oregon, 4 Rod Stewart, 5 Dell, 6 Numbers,

9 Astronomer, 11 Mermaids, 12 Wattles, 14 Blinds, 16 Sugar, 17 Knot.