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Sedimentary rock (9)

Ross

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9

'sedimentary rock' is the definition.
(limestone is a kind of sedimentary rock)

This is the entire clue.

(Other definitions for limestone that I've seen before include "Rock of calcium carbonate" , "Hard calcium rock" , "Mineral" , "building material" , "Caves in here perhaps" .)

I've seen this clue in The Times and the Sydney Morning Herald.
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