Hard rock (7)
'hard rock' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for marble that I've seen before include "Ramble (anag.)" , "Small ball of glass used in games" , "Glass ball toy" , "Hard crystalline limestone used for sculptures" , "Hard crystalline metamorphic rock" .)
'hard rock' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for granite that I've seen before include "Hard granular rock" , "determination" , "Coarse-grained igneous rock" , "Hard stone from Tangier" , "Tangier (anag.)" .)