The most common and most likely answer to this crossword clue is the 9 letter word AVUNCULAR
I've seen this crossword clue in The Daily Telegraph
A
V
U
N
C
U
L
A
R
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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 AVUNCULAR mean?
AVUNCULAR adjective- In the manner of an uncle, pertaining to an uncle.
- (by extension) Kind, genial, benevolent, or tolerant.