The answer, perhaps, is distinctly sour (5)

I believe the answer is:

lemon

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'sour' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

(Other definitions for lemon that I've seen before include "Fruit (which is proverbially "the answer")" , "Melon is another fruit" , "source of juice" , "Fruit - as an answer it's unsatisfactory" , "Fruit - 11 (anag)" .)

I've seen this clue in the Evening Standard.

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