Material for some keys turned by one (5)

I believe the answer is:

ebony

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'material' is the definition.
(ebony is a kind of material)

'some keys turned by one' is the wordplay.
'by one' anagrams to 'EBONY'.
But, I'm not sure how this is indicated.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for ebony that I've seen before include "Material for key" , "Very dark black" , "hard stuff" , "Black hardwood" , "Dark hardwood" .)

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