The most common and most likely answer to this crossword clue is the 9 letter word ACCLIMATE
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The straight part
We know that "adapt" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case adapt = acclimate.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 ACCLIMATE mean?
ACCLIMATE verb- To habituate to a climate not native; to acclimatize.
- To adjust to a new environment; not necessarily a wild, natural, earthy one.
- To become accustomed to a new climate or environment.