Crossword Genius

An instrument for varying an electric resistance (8)

Ross

I believe the answer is:

rheostat

(Other definitions for rheostat that I've seen before include "The rotas (anag.)" , "Current controller" , "Sort heat with Instrument that controls the current in an electrical circuit" , "Variable resistor" , "Current-changing device" .)

I've seen this clue in The Independent.
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