One circular stage....there are seven positions in it, one

i think answer is 7!.
I know this is counter intuitive, let me first begin with a simple example of permutation in a circle.
First if it is a circle with no marking on any position answer wud be = 6!
This is because for the first person all positioins are identical/same, so he has no choice. Thus choice begins with 2nd persona who has 6 choices, 3rd 5, 4th 4 ... and so on we get total ways to arrange them = 6!

Now when one position is marked then all positions in a circle becomes unique (because of red mark). Thus from the 1st person itself we will have choices. Hence answer = 7!
something more to ponder: if clockwise and anti-clockwise does't matter then answer = 7!/2 (In 7! we assume that clockwise and anticlock wise are different arrangements)
hope this helps...
-Vicks