Fortune-telling board (5)
I believe the answer is:
ouija
'fortune-telling board' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ouija that I've seen before include "Medium's medium?" , "- Board may be used in a seance" , "This board is used in spiritualistic sessions" , "This board is used in spiritualist proceedings" , "This board is used in spiritualism" .)