Possible Clues:

• Schools not wanting one mum or dad, that's clear
• Coaches dismissed one child's father -- that's obvious
• Obvious — ingenuous
• Schools expelling one older member of family, it's clear
• A new spring runs into river as unpolluted water?
• Obvious replacement for Ant's partner
• Sheer pants aren't fashionable to have run in
• Mean to be among entrants playing in Open
• A new pole will be inserted into river, that's clear
• Cross-dressing relative easily identified