Crossword Genius

Clever Irish mother extracted magnesium, and sorted it out (6)

Ross

I believe the answer is:

genius

I'm a little stuck... Click here to teach me more about this clue!

'clever irish' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe you can see a link between them that I can't see?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for genius that I've seen before include "great idea?" , "outstanding person" , "One has outstanding creative or intellectual ability" , "Huge mental ability" , "Maestro" .)

I've seen this clue in The Irish Times.
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