Cryptic crossword clue
Regularly sits up pining, burning the midnight oil 8

The most common and most likely answer to this crossword clue is the 8 letter word STUDYING

I've seen this crossword clue in The Guardian
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Buddy explains!

The straight part
We know that "burning the midnight oil" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case burning the midnight oil = studying.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does STUDYING mean?

STUDYING verb
  1. (usually academic) To review materials already learned in order to make sure one does not forget them, usually in preparation for an examination.
  2. (academic) To take a course or courses on a subject.
  3. To acquire knowledge on a subject with the intention of applying it in practice.
  4. To look at minutely.
  5. To fix the mind closely upon a subject; to dwell upon anything in thought; to muse; to ponder.
  6. To endeavor diligently; to be zealous.
STUDYING noun
  1. The action of the verb to study.

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