Crossword Genius

Rating's announced for electrical unit (7)

Ross

I believe the answer is:

siemens

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'unit' is the definition.
(siemens is a kind of unit)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for siemens that I've seen before include "Unit of conductance" , "measure of juice" .)

I've seen this clue in The Independent.
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