Possible Clues:

• Faint hue
• A smack can upset, for example
• Colour metal, for example, reflected
• Just the slightest amount
• Can, for example, turn up hint
• Colour's no good in item of male apparel
• Momentary pain but no sign of worse colouring
• Touch (of colour?)
• A shade or a nuance
• One has a gent around to give one a bit of shade