How do you hide a spy camera in a toy clock or light fixture?

I dont understand how this works. I want to put one in my sensor light outside my house but i just dont understand how it can work. Can I maybe hang a plant outside my door and put it in there? I need to catch someone stealing from my house and dumping trash on my lawn please help me!
I was thinking of hanging a plant at the front door and putting a hole in the bowl and the bottom and putting the small mini pin hole camera in there. I still dont know what i need to buy to make this work.