Possible Clues:

• Reliant
• Person supported by another person
• Child, say, in part of pool with lower energy, not disheartened
• Writer protected by editor when in depression, as a hanger-on
• English writer's study into origins of Doctor Thorne needing support
• Tax deduction
• Tax-reducer
• Exercise in study girl with dictionary finds weak
• Needing support of French writer, having depression
• Subject twin studies with time including PE