1: Members of Ravenclaw hit Hermione where? (7)
4: Which creatures are found in factions? (7)
8: Drunkard turns to observe drunkard (7)
10: Excite mirth in a daughter of Mnemosyne (5)
11: Backward South American city captured by Bill (9)
12: Archipelagos concluded thus in Nigeria (5)
13: Escalating naked conflict (3)
15: Thus might florin study a silly timekeeper (3-3,5)
17: Exchange recipe describing a small amount of relish on rolled up taco (11)
19: Emergency room stocks one sensitive organ (3)
21: Fur from hormone treatment I took - it's mortifying (4,5)
24: Disgusting donut turned a greenish color (5)
25: Send inmates free gin (7)
26: Appreciate it: a large data format (7)
27: College entrance exam angers with parodies (7)