The most common and most likely answer to this crossword clue is the 11 letter word BENEVOLENCE
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More clues leading to the result BENEVOLENCE
Buddy explains!

The straight part
We know that "generosity" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case generosity = benevolence.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 BENEVOLENCE mean?
BENEVOLENCE noun- Disposition to do good.
- Charitable kindness.
- An altruistic gift or act.
- A kind of forced loan or contribution levied by kings without legal authority, first so called under Edward IV in 1473.