The most common and most likely answer to this crossword clue is the 7 letter word ALBEDOS
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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 ALBEDOS mean?
ALBEDOS noun- The fraction of incident light or radiation reflected by a surface or body, commonly expressed as a percentage.
- The whitish inner portion of the rind of citrus fruits that is a source of pectin, commonly referred to as the pith.
- One of the four major stages of the magnum opus, involving purification of the prima materia.