Possible Clues:

• Slightly unwell
• Not on green, perhaps, yet below par
• Green around the gills; pale
• Well, one is not on the shade any longer
• Blue?
• Away on business, look over an ancient city that's run down
• Unwell or indelicate - a bit pale?
• Where the shade's concerned, is it just not on? Well, not very
• When joking, blue and a bit sick
• Unwell or mildly indecent