Possible Clues:

• Earth used in pigments
• Colour sergeant's third in line for launching missiles
• Is, by the sound of it, the pig meant to be so yellow?
• It's quite a chore to be so earthy
• Pigment that's hot in molten core
• Saffron
• Yellow's right in the firing line
• It might be quite a chore to be so yellow
• It's chore changing yellow pigment
• Pale brownish-yellow colour or pigment