### Clue: Left voting system in the toilet (3)
### Answer: LAV 
 ### Explanation: Definition: toilet
  L($$l$$eft) + AV(abbrev. for "Alternative Vote", a system of voting where each voter has the option of ranking candidates). 
Answer: Another toilet reference, short form of lavatory.  The surface makes reference to a UK referendum that definitely rejected AV – left it in the toilet, so to speak.  Another political reference.