Crossword Genius

Grand house excludes liberal section of society (5)

Ross

I believe the answer is:

caste

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'society' is the definition.
(thesaurus)

I don't understand the remainder of the clue.

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(Other definitions for caste that I've seen before include "Social division in India" , "Social class in Hinduism" , "Brahmans for instance" , "Social station" , "Group within society" .)

I've seen this clue in The Times.
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