Barsetshire cliques? (4)

I believe the answer is:

sets

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'cliques?' is the definition.
(clique is a kind of set)

'barsetshire' is the wordplay.
'SETS' is hidden in amongst the letters.
But, I am uncertain how this is indicated.

Can you help me to learn more?

(Other definitions for sets that I've seen before include "Classes" , "Plants" , "Groups of things of the same kind" , "Scenery etc. of 11 across productions" , "Major divisions of tennis match" .)

I've seen this clue in the Evening Standard.

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