The most common and most likely answer to this crossword clue is the 8 letter word CRYSTALS
C
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The straight part
We know that "glasses" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case glasses = crystals.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 CRYSTALS mean?
CRYSTALS noun- A solid composed of an array of atoms or molecules possessing long-range order and arranged in a pattern which is periodic in three dimensions.
- A piece of glimmering, shining mineral resembling ice or glass.
- A fine type of glassware, or the material used to make it.
- Crystal meth: methamphetamine hydrochloride.
- The glass over the dial of a watch case.