1: Measure of heat in the empty room (5)
4: Discourage trendy princess's affectation (9)
9: Catches misusing teen slang (9)
11: Point back to itself. (5)
12: ...near fishing boats stocked with cold bait (5,8)
14: Fastener made from crumpled ripple pac (9)
15: Hangs ten vassals at hearing (5)
17: Wants - in fact, just has to have (5)
20: Tour with crazy Mrs. Barton (9)
22: Rise as in throw, perhaps, showing fitness to fly (13)
24: Create an impression on an envelope? (5)
26: It causes a crash for one who owns a lot? (9)
27: Smokey's threat turning up deep in northern parts (5,4)
28: They secure money for the government, so we hear (5)