Psychoactive (14)

I believe the answer is:

hallucinogenic

'psychoactive' is the definition.
(similar in meaning)

This is the entire clue.

(Other definitions for hallucinogenic that I've seen before include "Causing unreal perceptions" , "leading to false perceptions" , "Some mushrooms are" , "Causing mental visions" .)

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

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