I really think that is a program specific question. I read on a programs site that deferring was not possible but I don't recall it being explicitly stated on others.
If you are referring to clinical doctoral program, most are tracked programs and you wouldn't be able to just jump in second semester, you would probably need to start from Y1 S1. Is it possible you could complete your bachelors degree over the spring / summer term and go straight into school in the fall?