It ends stirringly, with me captured in the grounds (8)

I believe the answer is:

sediment

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'grounds' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

(Other definitions for sediment that I've seen before include "Deposit at the bottom of a liquid" , "Grounds - debris" , "Material settling out in a liquid" , "Residue" , "Matter sinking to the bottom of a liquid" .)

I've seen this clue in the Evening Standard.

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