Stadium reduced to dust? (6)
I believe the answer is:
ground
I believe this clue is a double definition.
'stadium' is the first definition.
(eg a football ground)
'reduced to dust?' is the second definition.
(I've seen this before)
(Other definitions for ground that I've seen before include "Land; reduced to powder" , "Powdered; land" , "Bring down" , "crushed into small particles" , "Minced" .)