The most common and most likely answer to this crossword clue is the 5 letter word RABBI
I've seen this crossword clue in The Times
R
A
B
B
I
More clues leading to the result RABBI
- Community leader to go on endlessly
- Law scholar losing time in talk
- Scholar to talk endlessly
- Sacks, say, for endless waffle
- Blue? No time to talk
- Scholar of Burns, mostly
- Religious scholar with gas head of teaching avoided
- Scholar to witter interminably
- Religious leader's endless talk
- Teacher’s pet? Not quite
Buddy explains!

The straight part
We know that "Community leader" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case community leader = rabbi.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 RABBI mean?
RABBI noun- A Jewish scholar or teacher of halacha (Jewish law), capable of making halachic decisions.
- A Jew who is or is qualified to be the leader of a Jewish congregation.
- (police) A senior officer who acts as a mentor.