A meeting of mediums (6)
I believe the answer is:
seance
'a meeting of mediums' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for seance that I've seen before include "Medium experience?" , "Dead-contacting meeting" , "Spiritualist meeting, all hold hands" , "Medium's session" , "Some may arrive late to this meeting" .)