Hallucinate when taking ecstasy? That’s nonsense (5)
I believe the answer is:
tripe
'that's nonsense' is the definition.
(informal term for nonsense or false information)
'hallucinate when taking ecstasy?' is the wordplay.
I cannot really see how this works, but
'hallucinate' could be 'trip' (I've seen this in another clue) and 'trip' is present in the answer.
'ecstasy?' could be 'e' (informal term for the drug) and 'e' is found within the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for tripe that I've seen before include "What some northerners eat" , "Junk; food" , "Edible lining of cow's stomach - rubbish" , "Bunk" , "which a freegan might eat?" .)