Pulverised (6)
I believe the answer is:
ground
'pulverised' is the definition.
(past tense of 'grind')
This is the entire clue.
(Other definitions for ground that I've seen before include "Soil - don't allow to fly - reason" , "Land; reduced to powder" , "Earth; crushed to powder" , "Earth surface, land" , "Earth; stop from flying" .)