The answer is to have a liquid mixture (8)

I believe the answer is:

solution

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'liquid mixture' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

(Other definitions for solution that I've seen before include "Way out" , "compound" , "Liquid mixture of two or more substances" , "Holmes often sought?" , "something involving less concentration" .)

I've seen this clue in the Evening Standard.

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