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

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