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

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