I am a pro in NoVa, and my indoor clinics start in a about a week.
Thought I would throw a comment out there. I have 13 and 14 week packages for around 20 an hour, and that includes court fees, balls, water, etc. Also you can play week to week for $28 or get a package in between as well.
I have a solid group of regulars but still a couple spots left. Clinics for all levels fro beginner to advanced.
Also I guarantee my clinics if you are not completely happy with the first clinic you pay nothing.