Bags of coarse material (5)

I believe the answer is:

sacks

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'bags' is the definition.
(sack is a kind of bag)

I can't explain the remainder of the clue.

(Other definitions for sacks that I've seen before include "Dismisses; bags" , "sends up in flames" , "Cashiers" , "Terminates employment as punishment" , "Gets rid of" .)

I've seen this clue in the Evening Standard.

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