"Denizen of cheap lodging house," I enter in the file (7)

I believe the answer is:

dossier

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'file' is the definition.
(both can mean a collection of information)

I don't understand how the rest of the clue works.

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(Other definitions for dossier that I've seen before include "Papers containing detailed information about someone" , "Set of documents about person" , "File of papers (sometimes dodgy)" , "Papers containing detailed information about a particular person" , "A collection of papers" .)

I've seen this clue in the Evening Standard.

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