Reportedly lousiest sausage (5)

I believe the answer is:

wurst

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'sausage' is the definition.
(I've seen this in another clue)

I cannot understand how the remainder of the clue works.

(Other definitions for wurst that I've seen before include "Banger" , "Large German or Austrian sausage" , "fare from Berlin" .)

I've seen this clue in The Sun.

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