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The basics one gets down to when stony? (7)

Ross

I believe the answer is:

bedrock

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'the basics' is the definition.
(synonyms)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for bedrock that I've seen before include "Basis" , "Solid foundation" , "Fundamental principles" , "Fundamental principle" .)

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