Fibre from coconut husks (4)

I believe the answer is:

coir

'fibre from coconut husks' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for coir that I've seen before include "Coarse fibre from a coconut husk" , "Coconut husk fibre used for making matting" , "Fibre from coconut husks" , "growing medium" .)

I've seen this clue in The Telegraph and The Guardian.

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