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  <rect width="200" height="200" id="rect"/>
  <use id="use" xlink:href="#rect"/>
</defs>
<clipPath id="clip1">
  <use xlink:href="#use" />
</clipPath>

<rect width="400" height="400" fill="red" clip-path="url(#clip1)"/>
<rect width="200" height="200" fill="green" />
</svg>