Possible Clues:

• Review fake nails, say
• Study chopped-up snail say
• Study broken nails, say
• Broken nails, say, producing criticism
• Psychotherapy
• Using any sails in storm may result in breakdown
• 'A girl, in Wonderland is having an examination (8)'
• Breakdown is its own possible cure
• See 3
• Alan's suffering little sister following day's end breakdown