The most common and most likely answer to this crossword clue is the 9 letter word SENSITISE
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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 SENSITISE mean?
SENSITISE verb- To make (someone or something) sensitive or responsive to certain stimuli.
- To make (someone) increasingly aware of, in a concerned or sensitive way.
- To render capable of being acted on by actinic rays of light.