Yes, you can go for it

Hi,

As of now, only those candidates belonging to Unreserved/OBC/Specially Abled Persons (SAP) and other categories, and will be considered eligible for taking part in CLAT who have secured minimum 45% in the qualifying examination (i.e., 10+2). As you have scored 45% in Class 12, you can appear in CLAT. I hope it helps!

http://information.clat.ac.in/eligibility.html