Crossword Genius

He doesn't appreciate where the coal goes (7)

Ross

I believe the answer is:

ingrate

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This clue could be a double definition.

'he doesn't appreciate' is the first definition.
(I've seen this before)

'where the coal goes' is the second definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

Can you help me to learn more?

(Other definitions for ingrate that I've seen before include "No thanks, I say!" , "He doesn't appreciate" , "Churlish type" , "One who never says thanks" , "Unappreciative person" .)

I've seen this clue in The Irish News and The Globe and Mail.
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