File 'requiring less effort', fancifully? (7)

I believe the answer is:

dossier

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'file' is the definition.
(I've seen this before)

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

(Other definitions for dossier that I've seen before include "Set of documents about person" , "Papers containing detailed information about someone" , "File on a person or topic" , "Record" , "Set of papers" .)

I've seen this clue in The Everyman puzzle in The Observer.

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