A medium state, perhaps (6)
I believe the answer is:
trance
'a medium state' is the definition.
(I've seen this in another clue)
'perhaps' is the wordplay.
I cannot quite see how this works, but
'perhaps' could be 'ance' (I've seen this in other clues) and 'ance' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for trance that I've seen before include "Sleep-like state experienced in canter" , "Hypnotised state" , "Canter into state of hypnosis" , "Canter in dream-state" , "Mental state of a medium during a 19 across?" .)