Crossword Genius

A thin layer of tissue forming the boundary of a living cell or organ (8)

Ross

I believe the answer is:

membrane

(Other definitions for membrane that I've seen before include "Thin sheet as a barrier" , "Thin sheet that surrounds body parts" , "Tissue layer" , "Thin pliable sheet of material" , "Thin sheet surrounding body parts" .)

I've seen this clue in the Sydney Morning Herald.
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