Unit of resistance (3)

I believe the answer is:

ohm

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

This is all the clue.

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

I've seen this clue in The Times, the LA Times, The New York Times, The Mirror, the USA Today, the King Feature Syndicate, The Independent, The Sun, the Universal, The Guardian, the Penny Press, the Sydney Morning Herald, The Sunday Times and The Wall Street Journal.

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