Possible Clues:

• Prepare too hard for open rule, by the sound of it
• School too much — maybe maiden will get transport home?
• Run past peak, perhaps, in bad weather on plain
• Practise too hard, concerning coaches
• There's clear water if you go beyond the peak
• Exercise too much in wet weather, as seen by public
• Clear water becomes stale
• Spend too much time on exercises completed at school
• Practise too hard in cricket period, having a number of coaches
• Spend too much time running to Guernsey to get away from veterinary surgeon