Unit of electrical resistance (3)

I believe the answer is:

ohm

'unit of electrical resistance' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for ohm that I've seen before include "Physicist" , "Unit of electrical resistance (3)" , "SI unit of electrical resistance" , "A little resistance" , "physical unit" .)

I've seen this clue in The Wall Street Journal, The Guardian, The Telegraph and the Universal.

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