The most common and most likely answer to this crossword clue is the 9 letter word ACTUALISE
I've seen this crossword clue in The Guardian
A
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Buddy explains!

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 ACTUALISE mean?
ACTUALISE verb- To make real; to realize.
- To become actual or real.
- To realize one's full potential.