### Clue: Room the Queen gives the field marshal (9)
### Answer: KITCHENER 
 ### Explanation: Definition: the field marshal
  KITCHEN(room) ER($$E$$lizabeth ­$$R$$egina, the Queen)
Defn:  Field Marshal Herbert Horatio Kitchener who later became an aide-de-camp to Queen Victoria, which Queen gave him a room, I presume, as the clue says.