Adobe Photoshop CC 2014 v.14.xx - Manual (Page 321)

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Hold down Alt (Windows) or Option (Mac OS), position the pointer over the line separating two grouped layers in the Layers panel (the
pointer changes to two overlapping circles ), and click.
In the Layers panel, select a layer in the clipping mask, and choose Layer > Release Clipping Mask. This command removes the
selected layer and any layers above it from the clipping mask.
Release all layers in a clipping mask
1. In the Layers panel, select the clipping mask layer just above the base layer.
2. Choose Layer > Release Clipping Mask.
More Help Topics
About masks and alpha channels
Applying filters video
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