Scorn letters with a repetitiveness about them (6)

I believe the answer is:

deride

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

I cannot understand how the rest of the clue works.

(Other definitions for deride that I've seen before include "Speak of with contempt" , "Mock and jeer" , "Jeer, belittle" , "Test performance" , "Ridicule, scoff at" .)

I've seen this clue in the Evening Standard.

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