Diocese in southeast Middlesex (3)

I believe the answer is:

see

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'diocese' is the definition.
(thesaurus)

'in southeast middlesex' is the wordplay.
'in' is an insertion indicator.
'southeast' becomes 'se' ('SE' can be a synonym of 'southeast').
'middlesex' becomes 'e' (I am not sure about this - if you are sure you should believe this answer much more).
'se' going around 'e' is 'SEE'.

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(Other definitions for see that I've seen before include "Three points" , "Understand; view" , "Set eyes on" , "Witness; ensure" , "ecclesiastical division" .)

I've seen this clue in the Evening Standard.

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