The most common and most likely answer to this crossword clue is the 9 letter word GRATITUDE
I've seen this crossword clue in Financial Times
G
R
A
T
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More clues leading to the result GRATITUDE
- Argued violently about foolish person’s appreciation of kindness
- Drug tea? It excited a feeling of appreciation
- Appreciation of view expressed by King George?
- Thanks Greek with feeling? Not the first time
- Ted with guitar shredding wins appreciation
- Thanks from gangster initially discourteous about misbehaving
- One is thankful to have it
- If one is thankful, one expresses this
- Feeling thankful that class admitted bird first up
- Recycled true ID tag, thanks
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 GRATITUDE mean?
GRATITUDE noun- The state of being grateful.