Prudent course resulting from successful seance? (5,6)

I believe the answer is:

happy medium

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'prudent course' is the definition.
'happy medium' can be an answer for 'course' (I have seen 'sensible course' mean 'happy medium' so perhaps 'course' could also mean 'happy medium'). I am not certain of the 'prudent' bit.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for happy medium that I've seen before include "Sensible middle way" , "Golden mean" , "Satisfactory compromise" , "pleased spiritualist" , "Channel broadcasting good news" .)

I've seen this clue in The Times.

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