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This is the only one I can't solve.
_o_a_(5)

A pinch of sand will make it dry.

I think you already had this answered last year:

https://www.crosswordsolver.org/forum/715700/a-pinch-of-sand-will-make-it-dry/

How very thorough Spoffy and pulling me up short w my memory. Came across the unfinished crossword again today in a covid induced clear out. Can't think why I hadn't filled in the answer. Big thanks.