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So angry, remove hard material (7)

Ross

I believe the answer is:

tussore

I'm a little stuck... Click here to teach me more about this clue!

'so angry remove' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'hard material' is the wordplay.
I cannot really understand how this works, but
'hard' could be 'sore' (I've seen this before) and 'sore' is found in the answer.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for tussore that I've seen before include "silk dress" , "Strong Indian silk" , "Rough silk" , "fabric" .)

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