### Clue: Fancy one mortal too often (4)
### Answer: LUST 
 ### Explanation: Definition: Fancy
  I'm not sure about this one.  If I'm right, then *fancy* = LUST.  I'm even more unsure about the wordplay:  can only speculate that since Lust is one of the deadly sins, it would somehow be related to a *mortal* sin.  Any correction or confirmation would be appreciated.