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Jolly experience with hallucinogen (4)

Ross

I believe the answer is:

trip

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'jolly' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

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(Other definitions for trip that I've seen before include "... the light fantastic to dance" , "Device working a trap or alarm when stumbled over" , "Hallucinatory experience" , "a result of drug-taking" , "Journey, excursion" .)

I've seen this clue in The Sun and The Telegraph.
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