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

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