Hy Lakshita!! 

If you have applied for CLAT , then you need not to register for BA LLB , as CLAT is conducted for giving admissions in LLB integrated course of 5 years. It could be ballb or bba llb or bcom llb depending upon your interest but this decision you have to take after you are alloted a college. So if registered for clat, you need not to apply for ballb separately.

Hope it helps!!

All  the best!!