Good Luck and here is a long list of tips when you DJ and some may help in your clip aswell. I think this was posted on our staff forums by Adzeh some time back.

These two I though were particularly helpful if you're applying to be a DJ.

Speak to listeners as though they are your good friends : Nobody likes an awkward DJ who is over professional; have fun with the listeners, get chatting and act like you have known them all your life. It will reflect on your shows and popularity, trust me

Be sure of what you are going to say before you say it : The amount of "Erm"'s I hear everyday is appauling, make sure you know exactly what you are going to talk about after a song at least 30 seconds before it finishes.

Echoes : Don't say the same things every time a song finishes and you start speaking again, you sound unprofessional and stupid. Mix it about and give it some welly.

Always be honest in your application and give it your all!

Good Luck,
Grig