Cryptic crossword clue
Late study of lutetium, copper and boron quota 11

The most common and most likely answer to this crossword clue is the 11 letter word LUCUBRATION

I've seen this crossword clue in The Times
L
U
C
U
B
R
A
T
I
O
N

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The straight part
We know that "Late study" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case late study = lucubration.
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.

Crossword Answer definitions

LUCUBRATION noun
  1. Intense and prolonged study or meditation; especially, late at night.
  2. The product of such study; often, writings.

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