Wine expert sozzled at rest (6)

I believe the answer is:

taster

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'wine expert' is the definition.
(I've seen this in another clue)

I cannot understand how the remainder of the clue works.

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(Other definitions for taster that I've seen before include "Art set (anag.)" , "Quality assurance worker" , "Food tester" , "Small sample" , "Winery worker" .)

I've seen this clue in The Sun.

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