Charlton, in the London area (6)
I believe the answer is:
heston
If this is the answer, I'm afraid I cannot explain it.
Can you help me to learn more?
(Other definitions for heston that I've seen before include "Service Area on M4" , "__ Blumenthal, celebrity chef" , "US star" , "Charlton __, actor - __ Blumenthal, chef" .)