Room for mental improvement perhaps (5)

I believe the answer is:

study

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'room' is the definition.
(study is a kind of room)

I can't explain the rest of the clue.

(Other definitions for study that I've seen before include "Office at home" , "Room for work/reading" , "Work-room" , "Writing-room" , "Scrutinize" .)

I've seen this clue in The Globe and Mail.

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