1: San Francisco athlete captures wild boar, an obvious choice (2-7)
2: This erratic 23-down twisted neck (7)
3: Former color no longer in production? (7)
4: Like a high ranking diplomat's awful ambrosia salad (13)
5: A methodical soldier? (7)
6: Lug worm finally being a symbol (5)
8: Monarch met monarch in even open space for coin-operated machines (7,6)
9: Put a new value on what secret agent is hiding (5)
13: Avoids seeds, pits, nuts (9)
14: Why give someone a ticking off? (4,3)
15: Shatters ice cubes (5)
16: Its undergoing change regarding the performer (7)
17: An inhabitant of Eastern Europe makes love nearer the middle (7)
18: Vagrant going over a little river to a foreign country (5)