Possible Clues:

• Diver's rotation
• Exercise high season flavouring, they say
• Turnover from two seasons, say
• Low turnover?
• During which heads are almost sure to roll?
• Turn head over heels
• Turnover made by fair-weather sailor, say
• Masseur left to restore full body movement
• Almost sure to take a turn in the air
• Gymnast's specialty, perhaps