Red clubman revolting in old county (10)

I believe the answer is:

cumberland

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'old county' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

'red clubman revolting' is the wordplay.
'revolting' is an anagram indicator.
'red'+'clubman'='redclubman'
'redclubman' anagrammed gives 'CUMBERLAND'.

'in' is the link.

Can you help me to learn more?

(Other definitions for cumberland that I've seen before include "Historic north-western English county" , "Former English county" , "Former Northern county ..." , "sausage" .)

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