The most common and most likely answer to this crossword clue is the 9 letter word LECTURING
L
E
C
T
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G
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 LECTURING mean?
LECTURING verb- To teach (somebody) by giving a speech on a given topic.
- To preach, to berate, to scold.
- The act of delivering a lecture or harangue.