Do one of the following:

• Select the group that contains the clipping mask, and choose Object > Clipping Mask > Release.

• In the Layers panel, click the name of the group or layer that contains the clipping mask. Click the Make/Release Clipping Masks button at the bottom of the panel, or select Release Clipping Mask from the panel menu.

Because the clipping mask was assigned a fill and stroke value of None, it is now not visible unless you select it or assign it new paint attributes.