Crushed earth (6)
I believe the answer is:
ground
This clue is a double definition.
'crushed' is the first definition.
(synonyms)
'earth' is the second definition.
(I know that earth is a more specific form of ground)
(Other definitions for ground that I've seen before include "Pulverised; earth" , "crumbled" , "Stop (a pilot) flying" , "Terrain" , "Base; reason" .)