Cryptic crossword clue
It could improve your mood to snore in turns 9

The most common and most likely answer to this crossword clue is the 9 letter word SEROTONIN

I've seen this crossword clue in Independent
S
E
R
O
T
O
N
I
N

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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 SEROTONIN mean?

SEROTONIN noun
  1. An indoleamine neurotransmitter, 5-hydroxytryptamine, that is involved in depression, appetite, etc., and is crucial in maintaining a sense of well-being, security, etc.

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