Unit of resistance (3)

I believe the answer is:

ohm

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

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

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