Possible Clues:

• Shrub used for cosmetic colouring
• Lichen naturally contains this dyestuff
• A girl, did you say, returned for the dye?
• Source of some temporary tattoos
• Wife of William S is up for some shock treatment
• Salon selection
• Salon rinse
• (Shrub producing) reddish dyestuff
• Carrot Top's secret?
• Reddish salon dye