Crossword Genius

Variable resistance (8)

Ross

I believe the answer is:

rheostat

'variable resistance' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for rheostat that I've seen before include "Variable resistance" , "showing some resistance" , "Electrical device" , "Resistor for regulating current" , "Means of controlling resistance" .)

I've seen this clue in The Times.
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