Possible Clues:

• Mineral deposit right in missile launch area?
• Yellowish-brown pigment
• “A barge with ___-coloured hay dropt from the wharf”: Oscar Wilde
• Earth tone, in Canada
• Autumnal colour
• Prehistoric paint colour
• Colour of coach-horses seen every so often
• Colour of line round centre of Earth
• Golden rule primarily circumscribed by line competitors must not cross
• Drag, shifting old pigment