Crossword Genius

No ailment could be produced by this hormone (9)

Ross

I believe the answer is:

melatonin

'this hormone' is the definition.
(melatonin is a kind of hormone)

'no ailment could be' is the wordplay.
'could be' indicates anagramming the letters.
'no'+'ailment'='noailment'
'noailment' anagrammed gives 'MELATONIN'.

'produced by' is the link.

(Another definition for melatonin that I've seen is " Hormone secreted by the pineal gland".)

I've seen this clue in The Telegraph.
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