Possible Clues:

• Hair problems ... or a theme hint
• Hairy issue, or a hint to 20-, 26- and 51-Across
• Shock problem arising from acrobatic manoeuvre over object
• Hair frustrations, or what the words broken across the starred clues' answers are?
• Concern for a stylist, and what’s found in the circled letters
• Take off objects that make locks look unsightly
• Hairy problem? ... or a hint to this puzzle's theme
• Shared objectives may produce shock problem
• Pils drunk by nurses? Shock horror, for some
• Hairy problem