Cretan's strange hypnotic state (6)
I believe the answer is:
trance
'hypnotic state' is the definition.
(I've seen this before)
'cretan's strange' is the wordplay.
'strange' is an anagram indicator.
'cretan' anagrammed gives 'TRANCE'.
(Other definitions for trance that I've seen before include "Canter into hypnotic state" , "Deep sleeplike state" , "Sleep-like state perhaps induced by hypnosis" , "kind of altered state" , "Hypnotised state" .)