Possible Clues:

• More than a hypothesis, but not quite a law
• Greek astronomer Ptolemy ultimately finding ideal situation
• The hypotheses rather than the practice
• See 10
• Rewrite other conclusion to unsatisfactory hypothesis
• Eggs should be going up in your hypothesis
• View of Boris Johnson? He's divisive
• An idea for other changes just before the end of the alphabet
• General principle which explains some aspect of the world
• Practice's counterpart