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Unyielding state makes a Republican withdraw from group support (8)

Ross

I believe the answer is:

solidity

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'unyielding state' is the definition.
(state of being solid or unyielding)

I cannot understand how the remainder of the clue works.

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(Other definitions for solidity that I've seen before include "Substance" , "Firm quality" , "Firmness" .)

I've seen this clue in The Guardian.
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