Cryptic crossword clue
A measure of drink knocked back in bunk by this awfully fine writer 13

The most common and most likely answer to this crossword clue is the 13 letter word CALLIGRAPHIST

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

The straight part
We know that "fine writer" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fine writer = calligraphist.
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.

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