One seemingly delightful drink (8)

I believe the answer is:

smoothie

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'drink' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

(Other definitions for smoothie that I've seen before include "Sweet talker" , "Smarmy type" , "Plausible person" , "Thick, drink of pureed fruit" , "Glib speaker" .)

I've seen this clue in The Telegraph.

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