Crossword Genius

Dead rousing session putting up beacon - rake ash now and then (6)


I believe the answer is:


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'dead rousing session' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for seance that I've seen before include "Sitting - can see (anag)" , "Dead-contacting session" , "Meeting in which medium attempts to contact the dead" , "Meeting held by a medium" , "Medium experience?" .)

I've seen this clue in The Telegraph.
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