Paul is out of sugar-apple fruits (6)

I believe the answer is:

grapes

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'fruits' is the definition.
(grape is a kind of fruit)

I can't explain the rest of the clue.

(Other definitions for grapes that I've seen before include "Vine fruit" , "Fruit for wine" , "See 10 Across" , "Vine fruits" , "John Steinbeck wrote 'The . . . . . . of Wrath'" .)

I've seen this clue in the Irish Times.

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