In a west London town, I make a case (6)
I believe the answer is:
action
'a case' is the definition.
(both refer to legal proceedings)
'in a west london town i' is the wordplay.
'in' indicates putting letters inside.
'west london' becomes 'con' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'town' becomes 't' (abbreviation for town).
'a'+'con'='acon'
't'+'i'='ti'
'acon' placed around 'ti' is 'ACTION'.
'make' is the link.
Can you help me to learn more?
(Other definitions for action that I've seen before include "Battle - suit" , "SECOND PART OF 15" , "Take proceedings" , "claim in court" , "Military engagement" .)