Raving dean's foremost priest: one into drink! (8)

I believe the answer is:

delirium

(Other definitions for delirium that I've seen before include "State of violent mental agitation" , "Extreme mental disturbance" , "Febrile mental confusion" , "Disturbed state of mind during a fever" , "Wild state of mind" .)

I've seen this clue in The Sun.

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