Place the circle on top of the image.
Select the image and the circle and choose Object > Clipping Mask > Make
I used pen tool- with 1pt strokes. I made a shape:
white area is area I want to fill with pattern you can see on background. In the end have only fill my obejct with this pattern...
More Screen what happened.
EDIT2: I swaped the objects in layer menu up I placed my shape and tried to make cliping mask. result is this, how to apply it for whole shape?
Solved. Thank you. (sorry for later answer)