Area of London cut lights (9)
I believe the answer is:
docklands
'area of london' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.
'cut lights' is the wordplay.
'cut' becomes 'dock' (docking is a kind of cutting).
'lights' becomes 'lands' (I am not sure about this - if you are sure you should believe this answer much more).
'dock'+'lands'='DOCKLANDS'
Can you help me to learn more?
(Other definitions for docklands that I've seen before include "part of London" , "Redeveloped east London area" , "E. London area" .)