Cryptic crossword clue
Amount of light oil in musty nuts 10

The most common and most likely answer to this crossword clue is the 10 letter word LUMINOSITY

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

The straight part
We know that "Amount of light" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case amount of light = luminosity.
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 LUMINOSITY mean?

LUMINOSITY noun
  1. The state of being luminous, or a luminous object; brilliance or radiance
  2. The ratio of luminous flux to radiant flux at the same wavelength; the luminosity factor
  3. The rate at which a star radiates energy in all directions

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