Citrus fruit -- not round variety (5)

I believe the answer is:

range

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But I can't explain it at all! Could you help me understand?

(Other definitions for range that I've seen before include "Oven" , "Breadth (of variation)" , "Compass, extent" , "Large, grassy land for livestock in the US" , "Old-style cooking stove" .)

I've seen this clue in The Telegraph.

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