Your questions is missing a lot, and if you think people here will design it for you, you are right if you want to pay them. Otherwise they will direct you and help out.
Search google for a clap circuit. There are a few out there.
discrete one :
**broken link removed**
better one:
**broken link removed**
Then get a PIC and AVR chip, make an input pin to read the clap pulse and set a pin for output and use a pulse out to move the servo to where you want it.
Hope that helps.