Fruit served in medium large portions (6)

I believe the answer is:

medlar

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'fruit' is the definition.
(medlar is a kind of fruit)

I can't explain the remainder of the clue.

(Other definitions for medlar that I've seen before include "Red Mal turns to the fruit tree" , "Dermal (anag.)" , "Apple-like fruit" , "Led ram (anag) - fruit related to the apple" .)

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