Sack Susan, oddly regarded as revolutionary type

I believe the answer is:

sans serif

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'type' is the definition.
(sans serif is a kind of type)

I can't explain the remainder of the clue.

(Other definitions for sans serif that I've seen before include "Style of font" , "Plain style of type" , "Plain typeface" , "Style of typeface" , "plain type of face" .)

I've seen this clue in The Telegraph.

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