The most common and most likely answer to this crossword clue is the 10 letter word RESORCINOL
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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.
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What does RESORCINOL mean?
RESORCINOL noun- The diphenol meta-dihydroxy benzene, used as a mild antiseptic and in many industrial applications; isomeric with catechol and hydroquinone.