The most common and most likely answer to this crossword clue is the 8 letter word DESIRING
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More clues leading to the result DESIRING
Buddy explains!

The straight part
We know that "Wanting" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case wanting = desiring.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 DESIRING mean?
DESIRING verb- To want; to wish for earnestly.
- To put a request to (someone); to entreat.
- To want emotionally or sexually.
- To express a wish for; to entreat; to request.
- To require; to demand; to claim.
- To miss; to regret.
- A yearning for; a want.