Displaying CLOB data in Sql Developer 2

set serveroutput on format wrapped;

declare
   my_var long;
begin
   for x in ( select <col> from <table> where ... ) 
   loop
       my_var := dbms_lob.substr( x.<col>, 32000, 1 );
       DBMS_OUTPUT.put_line(my_var);
   end loop;
end;
/