You shouldn't need a license to do clerkships since you're just a student. You can generally do your clerkships in any state you want.
You may need a license before beginning your residency depending on which state you want to do a residency in—basically some states don't have resident licenses so you have to take part 3 of boards and get your license before residency in that case. In most states you won't need to take part 3 of boards or get a license before starting residency, you can do those things at a later date.
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