Lively person holds back bags of fine material (8)

I believe the answer is:

gossamer

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'fine material' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

(Other definitions for gossamer that I've seen before include "Filmy cobweb - very fine fabric" , "Really fine stuff" , "Very finest textured silk" , "Fine spider-threads" , "Threads from spiders" .)

I've seen this clue in The Times.

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