The most common and most likely answer to this crossword clue is the 8 letter word TESTICLE
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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 TESTICLE mean?
TESTICLE noun- The male sex and endocrine gland, found in some types of animals, that produces sperm and male sex hormones, including the steroid testosterone.