Resistance unit (3)

I believe the answer is:

ohm

'resistance unit' is the definition.
(ohm is the unit of electrical resistance)

This is all the clue.

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

I've seen this clue in The Wall Street Journal, the LA Times, the King Feature Syndicate, The Sunday Times and The Times.

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