The most common and most likely answer to this crossword clue is the 8 letter word GENEROUS
I've seen this crossword clue in The Guardian
G
E
N
E
R
O
U
S
More clues leading to the result GENEROUS
- Liberal possibly sour succeeding old Vincent
- Abuse one’s urge to be magnamimous
- Free intermingling of our genes
- Liberal urges one struggles with
- Kind of ancient Roman people keeping half of 13 confused
- Large part of one’s inheritance — get excited when it’s cut
- Urges one to become bountiful
- Liberal low-down love god embraces you say
- Ample nurse goes nearly crazy
- Free emperor kidnapped by group, both using the same name
Buddy explains!

The straight part
We know that "Kind" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case kind = generous.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 GENEROUS mean?
GENEROUS adjective- Noble in behaviour or actions; principled, not petty; kind, magnanimous.
- Willing to give and share unsparingly; showing a readiness to give more (especially money) than is expected or needed.
- Large, more than ample, copious.
- Invigorating in its nature.
- Of noble birth.