Burn the midnight oil

I think it could be either:

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study

'burn the midnight oil' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for study that I've seen before include "Read: den" , "Den; closely look at" , "Den - learning" , "Writing-room" , "Examine carefully" .)

I've seen this clue in The Mirror.

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