This material’s tough, one may imagine (5)

I believe the answer is:

stuff

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'this material's' is the definition.
('stuff' can be a synonym of 'material')

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for stuff that I've seen before include "Fill completely" , "Material - gorge" , "crowd" , "set with unspecified ingredients" , "Substance; material" .)

I've seen this clue in the Evening Standard.

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