Related Clues:

• The humour exemplified by teetotal head
• December, except the middle, should get a dry spell
• Shortage of rain
• Lack of water's hard in empty desert
• The quality of clothes protecting yachtsmen outside?
• Driver has nothing to drink!
• Water shortage
• Lack of rain
• Should be under doctor during dry spell
• Doctor should show cause of dehydration
• Trapped in Chad - rough terrain, shortage of water
• Small bones should desiccate in this?
• The quality of humour from heartless Yorkshireman in shift
• Shortage of water could be difficult in outskirts of desert
• Beginning of December, unpleasant time -- not what you expect then?