Sauce poured over centre of jelly - sounds rough (8)

I believe the answer is:

gravelly

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'rough' is the definition.
(I know that rough can be written as gravelly)

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

(Other definitions for gravelly that I've seen before include "Harsh and grating (of voice)" , "Like a drive" , "(Of voice) deep, rough" .)

I've seen this clue in The Irish Times.

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