Crossword Genius

Brain neurotransmitter (9)

Ross

I believe the answer is:

serotonin

(Other definitions for serotonin that I've seen before include "Compound in brain" , "Neurotransmitter hormone, involved in depression say" , "Compound in the blood affecting sleep and depression - soon inert (anag)" , "Compound present in serum - ironstone (anag)" , "Chemical compound in body" .)

I've seen this clue in The Times.
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