The most common and most likely answer to this crossword clue is the 9 letter word ENTHUSING
I've seen this crossword clue in Independent
E
N
T
H
U
S
I
N
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 ENTHUSING mean?
ENTHUSING verb- To show enthusiasm
- To cause (someone) to feel enthusiasm or to be enthusiastic