Crossword Genius

Attorney General shortly reveals some valuable material (6)

Ross

I believe the answer is:

silver

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

'material' is the definition.
(I know that silver is a type of conductor)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for silver that I've seen before include "Movies" , "The finest conductor" , "Twenty fifth anniversary metal" , "Sliver of precious metal" , "Change - Ag" .)

I've seen this clue in The Irish Times.
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