Hey Prabhat ,
Greetings!

Yes , you can definitely get admission in Delhi University even if you have not appeared in CLAT 2018 .
For that you will have to fill Delhi University's Application form by following the link mentioned below :-

https://ug.du.ac.in/app2k18/

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Hope this will help . Good Luck ! You can reply to this comment if you have any further queries , I will be happy to help .