A London house, possibly Roman (5)

I believe the answer is:

manor

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'a london house' is the definition.
'manor' can be an answer for 'house' (manor house is a kind of house). I am not certain of the 'a london' bit.

'possibly roman' is the wordplay.
'possibly' indicates an anagram.
'roman' is an anagram of 'MANOR'.

Can you help me to learn more?

(Other definitions for manor that I've seen before include "local copper's area" , "Large country house for Roman" , "home territory" , "Landed estate" , "Grand but strange Roman house" .)

I've seen this clue in the Evening Standard.

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