Flattened (5)
(Other definitions for rased that I've seen before include "Destroyed, tore down to the ground" , "totally devastated" , "brought low" , "Flattened to the ground" , "Levelled to the ground" .)
'flattened' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for oblate that I've seen before include "One dedicated to monastic life" , "dedicated individual" , "Top-flattened (sphere)" , "Like earth, flattened at the poles" , "One bound to religious life" .)