Units of electrical resistance (4)

I believe the answer is:

ohms

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

This is all the clue.

(Other definitions for ohms that I've seen before include "Electricity" , "working for the monarchy?" , "degrees of resistance" , "Frank on official post" , "Letters with official status in correspondence" .)

I've seen this clue in The Wall Street Journal, The Washington Post and The Irish Times.

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