Cryptic crossword clue
Wavelength reader from eastern stock 6

The most common and most likely answer to this crossword clue is the 6 letter word ETALON

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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 ETALON mean?

ETALON noun
  1. An optical device containing parallel mirrors, used as a narrow band filter, often in laser design.

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