Related Clues:

• Masseur's concern
• What masseurs work on
• Reason to take Valium
• Source of butterflies
• Cosmetic lotion
• Common reaction to 57-Across
• Condition of being taut
• Tight-head showing nerves
• What masseurs work out
• Strain shown by, say, future head
• Stress in past, for example, ultimately can make us nervous