The most common and most likely answer to this crossword clue is the 9 letter word NARCOTISE
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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 NARCOTISE mean?
NARCOTISE verb- To use a narcotic in order to make (someone) drowsy or insensible; to anesthetize, to drug.
- To dull the senses of (a person, place etc.).
- To make into a narcotic.