Possible Clues:

• Uses one's brain
• Tries to influence, with 'with'
• Tries to influence, with "with"
• Piece of sculpture, as on show in grounds
• Are wayward boys to be found in grounds?
• Concerned with a relation's explanations
• “Finding bad ____ for what one believes for other bad ____ — that’s philosophy” (Aldous Huxley)
• Rationalises
• Argues about working in a ship
• Works out, seeing others mostly surrounding a lad