I have a Enum like
namespace EnumTest
{
public class Enumeration
{
public Enumeration();
public enum Days
{
day
I'm not sure whether I understand you. If you have type name in a string object and want to get the type object you need to write the whole type name.
And because your enum is an inner type the full type name is "EnumTest.Enumeration.DaysEnumTest.Enumeration+Days".
To get the type object you can call then
Type type = assembly.GetType("EnumTest.Enumeration.DaysEnumTest.Enumeration+Days");