£51 for solution? (6)

I believe the answer is:

liquid

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'for solution?' is the definition.
(thesaurus)

I can't explain the rest of the clue.

(Other definitions for liquid that I've seen before include "Flowing" , "Fluid; not fixed" , "convertible" , "Neither sold nor gaseous" , "Non-gaseous fluid" .)

I've seen this clue in the Sydney Morning Herald.

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