Crossword Genius

Christmas stocking disappointment (4)

Ross

I believe the answer is:

coal

'christmas stocking disappointment' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for coal that I've seen before include "This consists mainly of carbon" , "Char" , "Three domestic fuels" , "Black mineral used for burning" , "Carbonized vegetable matter" .)

I've seen this clue in the Universal and the LA Times.
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