Possible Clues:

• One half of an item maybe from oral — class with marks deducted
• Trail around forlornly at first after Barbie's boyfriend -- is he or isn't he?
• Represented going steady?
• Romantically attached
• Engaged; reserved
• Taken — as cardinal suggested?
• Not a single radiator of note raised temperature centrally
• Track about boy with female, romantically attached
• Sons lacking means to get around know female in relationship
• Engaged part of wheel, front almost spinning