Crossword Genius

Citrus peel lining (4)

Ross

I believe the answer is:

pith

(Other definitions for pith that I've seen before include "White inner skin of an orange" , "Inside skin of, say, orange" , "Fibrous part of fruit - essence" , "The white part of the orange" , "Essential substance" .)

I've seen this clue in The Guardian.
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