The most common and most likely answer to this crossword clue is the 9 letter word SELF-LOVE
S
E
L
F
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L
O
V
E
Buddy explains!
The straight part
We know that "narcissism" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case narcissism = self-love.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 SELF-LOVE mean?
SELF-LOVE noun- Regard for oneself; love of oneself.
- Excessive pride or vanity, overvaluing the self.
- Masturbation.