The most common and most likely answer to this crossword clue is the 7 letter word WILLING
I've seen this crossword clue in Independent
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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 WILLING mean?
WILLING verb- To wish, desire.
- To instruct (that something be done) in one's will.
- To try to make (something) happen by using one's will (intention).
- To bequeath (something) to someone in one's will (legal document).
- The execution of a will.
- Ready to do something that is not (can't be expected as) a matter of course.