StretchClock is quick and easy to remove.
1) Click the "Mission Control" icon in the Dock, and your desktop zooms out to Mission Control.
2) Then Click Dashboard at the top of the screen
3) Notice StretchClock on the Dashboard.
click the "pause button"
You can unpause StretchClock at anytime.
4) OR you can Completely remove it from your computer by clicking the + button
5) Click "Manage Widgets"
6) Click the red minus sign by "StretchClock"
7) Click OK to delete StretchClock