Le __ Bleu: Julia Child's alma mater (6)

I believe the answer is:

cordon

(Other definitions for cordon that I've seen before include "Chain (of police)" , "Ring of, say, police enclosing something" , "Excellence in cooking is . . . . . . bleu" , "Ring of people guarding something" , "Line of police preventing passage" .)

I've seen this clue in the LA Times.

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