Treatment for kidney failure (8)

I believe the answer is:

dialysis

(Other definitions for dialysis that I've seen before include "Procedure for one with kidney failure" , "It's used in the case of kidney failure" , "Kidney failure necessitates this procedure" , "Purification of the blood by causing it to flow through a membrane" , "Blood purification process" .)

I've seen this clue in The Guardian.

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