Part of London prison housing two men finally considered reformed (6,4)
I believe the answer is:
camden town
'part of london' is the definition.
(I've seen this before)
'prison housing two men finally considered reformed' is the wordplay.
'prison' becomes 'can' (the can is American slang for prison).
'housing' means one lot of letters goes inside another.
'finally' indicates one should take the final letters.
'reformed' indicates anagramming the letters.
The final letter of 'considered' is 'd'.
'two'+'men'+'d'='twomend'
'twomend' is an anagram of 'mdentow'.
'can' enclosing 'mdentow' is 'CAMDEN TOWN'.
(Another definition for camden town that I've seen is " part of London".)