### Clue: Roundhead hid in tree in northern town (6)
### Answer: MARPLE 
 ### Explanation: Definition: northern town
  R(first letter,head of "round", split from "roundhead") **contained in**(hid in) MAPLE(common name for the genus of trees and shrubs, of which the sugar maple produces the sap that is made into syrup, sugar or toffee)
Answer:  A large village,town in Greater Manchester, northern England.  Also, Jane Marple, an amateur detective from Agatha Christie