Rude gobbling starter: slow down? (9)

I believe the answer is:

graceless

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'rude' is the definition.
(thesaurus)

I don't understand how the rest of the clue works.

(Other definitions for graceless that I've seen before include "clumsy" , "Lacking elegance" , "Awkward" , "Indecorous" .)

I've seen this clue in The Sun.

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