Possible Clues:

• Maybe put on a cap - it's a hanging matter
• It's hanging, but not so much at the turn
• Not so much at what's up is hanging down
• With 18 down, this might be hanging back at the start
• Mortarboard ornament
• Graduation-cap attachment
• It hangs down, but not so much at the turn-up
• It's hanging down, but not so much at the wrong way up
• Slates attached to ornamental bunch of threads
• 'Tuft' becoming 'uft' when written up?