### Clue: Source of energy for relative with skin problem (9)
### Answer: CARBUNCLE 
 ### Explanation: Definition: skin problem
  CARB(short for carbohydrate, which on metabolism provides,is a source of, energy) + UNCLE(a relative). 
Answer: An extensive eruption of the skin, caused by a pathogenic bacterium and similar to, but larger, more painful and more serious than a boil, a problem to say the least.