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Container filled with grit, else toxic spirit (11)

Ross

I believe the answer is:

poltergeist

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'spirit' is the definition.
(I know that poltergeist is a type of Ghost)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for poltergeist that I've seen before include "Disturbing ghost" , "Active ghost" , "Mischievous spirit" , "Noisy ghost" , "Destructive spirit" .)

I've seen this clue in The Telegraph.
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