Drop clustered constraint clause:
drop_clustered_constraint_option:
{
MAXDOP = max_degree_of_parallelism
| ONLINE = {ON | OFF }
| MOVE TO { partition_scheme ( column ) | filegroup
| "default"}
}
ALTER TABLE MyTable ALTER COLUMN MyOLDColumn DROP WITH MAXDOP=2;
"At a good table we may go to school" - Thomas Fuller