### Clue: Prime minister completely supported by the Queen, not going up to Yorkshire town (13)
### Answer: NORTHALLERTON 
 ### Explanation: Definition: Yorkshire town
  [NORTH(Lord Frederick, former prime minister of GB) + ALL(completely)] **placed above**(supported by, in a down clue) [ER($$E$$lizabeth $$R$$egina,the Queen) + **reversal of**(going up, in a down clue) NOT].