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Whereby patient session starts with therapist's bottom in designer chair amid wise pronouncement (10)

Ross

I believe the answer is:

psychiatry

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'pronouncement' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

I don't understand the remainder of the clue.

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(Other definitions for psychiatry that I've seen before include "Branch of medicine concerned with mental disorders" , "Trick cyclist's profession?" , "Treatment of the mind" , "Treatment of mental problems" , "Branch of medicine dealing with mental disorders" .)

I've seen this clue in The Guardian.
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