1: Witticism provided theme (5)
2: Greek city - in the Adriatic or in Thessaly (7)
3: Oak's first seen on the first of May with its leaves out (5)
6: Send Tim out for attitude (4-3)
7: New York decries eccentric period of medical training (9)
9: Toss a hammer into a nuclear accelerator! (4,7)
10: Hostile warning: one man has captured the queen (11)
13: Spy pinched mere fragments of treaty (9)
16: Damage the object, Mr. Gore, having to do with marriage (7)
17: Chalet I remodeled in conformance with professional standards (7)
18: At first several walk awkwardly to get the rest (7)
21: Eights had to race again, we hear, concerning fish spawn. (2, 3)
22: Wants - in fact, just has to have (5)