Crossword Genius

Hates rot (anag.) (8)

Ross

I believe the answer is:

rheostat

(Other definitions for rheostat that I've seen before include "The roast (anag.); electrical instrument" , "Variable resistor" , "Current-changing device" , "Current controller" , "Resistor for regulating current" .)

I've seen this clue in The Telegraph.
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