The most common and most likely answer to this crossword clue is the 6 letter word ADNATE
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The cryptic/wordplay part
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What does ADNATE mean?
ADNATE adjective- Linked or fused to a structure of a type different from itself; for example, attachment of a stamen to a petal is adnate, while attachment of a stamen to another stamen is connate.
- Growing with one side adherent to a stem; applied to the lateral zooids of corals and other compound animals. in fish, having the eyes fused and unable to rotate independently