Ken of Hampstead? (4)
I believe the answer is:
wood
'ken of hampstead?' is the definition.
The definition suggests a singular noun which matches the answer.
This is the entire clue.
Can you help me to learn more?
(Other definitions for wood that I've seen before include "Trees; club" , "Area of trees and shrubs" , "Grove" , "Revered Proms character" , "Concert promoter" .)