I got a newsletter which includes this picture
and I was wondering how the effect on the clock is achieved in photoshop.
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In Photoshop (Photoshop CC 2014) it can be found in:
Filter > Blur Gallery > Spin Blur
You can find more info in Adobe Photoshop documentation.
It's just the Radial Blur filter. However, if the idea is to replicate a slow shutter speed blurring the motion of the hands, it's poorly executed, because the entire clock face is blurred. Only the hands move, so only the hands should be blurred.