The most common and most likely answer to this crossword clue is the 9 letter word ADAPTABLE
I've seen this crossword clue in The Guardian
A
D
A
P
T
A
B
L
E
More clues leading to the result ADAPTABLE
- Willing to change a flat around, with addition of piece offurniture
- Flexible items for test carried back by porter
- Parents turning to furniture that’s easily modified
- Versatile plug attached to a piece of furniture receiving power
- Excellent spot to hold meet – the French will be flexible
- Commercial fitting expert can change
- Easy-going, fit sailor in lead at sea
- Fit powerful convertible
- Woman beginning to prepare meal is willing to fit in
- American with bald pate oddly plastic
Buddy explains!

The straight part
We know that "Easy-going" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case easy-going = adaptable.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 ADAPTABLE mean?
ADAPTABLE adjective- Capable of adapting or of being adapted.