Legal services is specifically covered under definition of professional services attracting TDS @10% beyond permissible threshold. See below:
“professional services” means services rendered by a person in the course of carrying on legal, medical, engineering or architectural profession or the profession of accountancy or technical consultancy or interior decoration or advertising or such other profession as is notified by the Board for the purposes of section 44AA or of this section;
Two points:
PT for consultants should not be deducted. As service providers, they need to get registered for PT and pay PT directly. PT applies to employees in an organization.
Legal students are generally not consultants because they do not possess the requisite minimum qualification as legal consultant. Better consider them as interns or trainees on a stipend.