Put in order for steadily diminishing ales (4)

I believe the answer is:

tidy

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'put in order' is the definition.
(thesaurus)

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

(Other definitions for tidy that I've seen before include "Neat, ordered" , "Clear up" , "generous" , "Uncluttered" , "Set in order" .)

I've seen this clue in the Irish Times (Crosaire) and the Irish Times.

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