1: Rapidity with which heat's dissipated (5)
3: Increase in force may finish in soccer riot (9)
8: As an aid to memory for broken men, first mode harmonics hold no danger. (9)
11: A clown circled at a distance (5)
12: Clothilda is carrying a parcel (3)
13: Word in a lexicon describing kind of number (7)
14: The time before the first woman (3)
15: Challenge the bench in retaliation. (13)
18: Shredded chad, he decrees, is one ingredient (7,6)
20: Nothing we have to pay (3)
22: Ship sails with masts surrounded by doom (7)
23: In no state to contain a pregnant virgin? (3)
24: Peeled, making Pop embarrassed? (5)
25: Companion to take care of worker (9)
26: Uncommon fly on rare plant (5,4)
27: Scheme conclusion for jet set (5)