Crossword Genius

A measure of resistance (3)

Ross

I believe the answer is:

ohm

This clue is a double definition.

'a measure' is the first definition.
(ohm is a kind of measure)

'resistance' is the second definition.
(thesaurus)

'of' acts as a link.

(Other definitions for ohm that I've seen before include "measure of resistance" , "SI unit of electrical resistance" , "lawmaker" , "A little resistance" , "physical unit" .)

I've seen this clue in the Evening Standard.
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