Possible Clues:

• Take a turn in the air
• Most rules improperly conceal a policy switch
• Turn over
• Feat of acrobatics needing considerable attack, they say
• Perform acrobatic feat season after season, we hear
• Acrobatic movement
• During which one is almost sure to be turned over?
• Tumbler's needed for this cocktail of rum, sloes, and a dash of tonic
• Trampoline maneuver
• Soundly season, repeat, roll ...