A drink where golfer finishes — and starts, we're told (5,3)

I believe the answer is:

green tea

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'a drink' is the definition.
(type of tea)

I can't explain the rest of the clue.

(Other definitions for green tea that I've seen before include "Teen rage (anag.)" , "Drink - generate (anag)" , "Colourful drink for teenager" , "Healthy drink" , "Infused drink" .)

I've seen this clue in The Guardian.

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