You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For consistency, answers should be in all lower cased letters.

Category: WATCHMAKER, WATCHMAKER
Clue: In 1924 England's John Harwood patented a watch that could do this to itself thanks to an internal swinging weight
wind itself

Category: STAGE NAMES
Clue: Riley is the first name of this guitarist whose stage initials stand for "Blues Boy"
b.b. king

Category: SABRINA'S WITCH HANDBOOK
Clue: (Hi, I'm Caroline Rhea) Like many modern witches, the Spellmans use an upright vacuum cleaner to do this, as well as to clean (not that we ever clean!)
fly