Many Agency Recruiters will run a 360 desk. The term 360 means that the recruiter will handle everything from acquiring new clients, landing new job orders, finding the right candidates, placing them, and all the paperwork required from start to finish.
Many of these tasks require the same skill set that a professional salesperson would have. Discuss any sales training you have and how you believe it will help you succeed in this role. If you do not have any sales training, you could ask the interviewer for recommendations of online sales courses or other helpful resources to grow your sales skills.