Ran out of material! (5)

I believe the answer is:

rayon

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'material' is the definition.
(rayon is a type of fabric)

I cannot understand how the rest of the clue works.

(Other definitions for rayon that I've seen before include "Synthetic fibre" , "Artificial silk fabric" , "Artificial fibre" , "Viscose fabric" , "Synthetic silk-like fabric" .)

I've seen this clue in the Evening Standard.

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