Superior copper wants start on case of sedition (6)

I believe the answer is:

snobby

'superior' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for snobby that I've seen before include "Snooty, stuck-up" , "superior" , "socially pretentious" .)

I've seen this clue in The Times.

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