Crossword Genius

Thickener made of butter and flour (4)

Ross

I believe the answer is:

roux

(Other definitions for roux that I've seen before include "Thickener for sauces" , "Mixture of fat and flour used for thickening sauces" , "Fat, flour sauce base" , "Sauce mixture" , "Mixture of butter and flour used for sauces" .)

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