When organised, it's a liver stimulant (9)

I believe the answer is:

vitaliser

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'stimulant' is the definition.
Both the definition and answer are singular nouns.
Maybe there's an association between them I don't understand?

'when organised it's a liver' is the wordplay.
'when organised' is an anagram indicator.
'its'+'a'+'liver'='itsaliver'
'itsaliver' anagrammed gives 'VITALISER'.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

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