Happy medium condition? (6)

I believe the answer is:

trance

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'medium condition?' is the definition.
(I've seen this in another clue)

I don't understand how the remainder of the clue works.

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(Other definitions for trance that I've seen before include "State of abstraction" , "Canter in dream-state" , "Dazed state" , "Ecstasy" , "Dream-like state" .)

I've seen this clue in The Globe and Mail.

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