An apprentice is an employee, not a student on placement. They are on your payroll, doing real work, from the first week. What makes it an apprenticeship is that a fifth of their contracted hours are protected for training, and that at the end an independent assessor confirms they can do the job against a national standard.
That is the whole bargain: you provide the job and the time, we provide the training and the assessment, and the standard makes the result mean the same thing to every other employer in the country.