Substance made up of many monomers (7)

I believe the answer is:

polymer

(Other definitions for polymer that I've seen before include "Compound with large molecules in simple repeated units" , "Material" , "Eg, protein, rubber etc." , "Substance with large molecules of smaller units" , "Compound of macromolecules (such as starch)" .)

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

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