Crossword Genius

Source of jelly part filling stomach after exercises (9)

Ross

I believe the answer is:

petroleum

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'source of jelly' is the definition.
(as in petroleum jelly)

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

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(Other definitions for petroleum that I've seen before include "Hydrocarbon fuel" , "It helps in getting things moving" , "Fossil fuel" , "Fuel oil" , "Oil well product" .)

I've seen this clue in The Times.
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