1: Trespass upon a moniker exploited by commercials (4,7)
2: Smokey's threat turning up deep in northern parts (5,4)
3: Beetles, for example, being produced by modern factions (7)
4: Timely introduction of purifier into terribly poor air (9)
5: 'An old Egyptian,' Mia said (7)
6: Ring around red gem (5)
7: Mr Stewart on the staff (3)
9: Pate topping primarily honey and tamari? (3)
12: Person with fixed notions is pretty sore, upset about the introduction of Ebonics (11)
14: Flimsy cord around basket material (9)
15: Prohibit a clone performing in past Olympic Games (9)
17: Resistance to change is smart; it's going back in time (7)
18: Hates and gets rid of a Mensa entry requirement? (7)
19: Hang out with Martha until incarceration (5)
21: Top card? Excellent! (3)
22: Going after the final piece of puzzle for a very long time (3)