There is currently no native support for embedding Clover in Confluence. Many use cases can be achieved however by using the {iframe} macro.
The following are examples of displaying live Clover data directly in Confluence.
{iframe:src=http://downloads.atlassian.com/software/clover/samples/lucene/dashboard.html|width=100%|height=500px}{iframe}
{iframe:src=http://downloads.atlassian.com/software/clover/samples/lucene/proj-risks.html|width=100%|height=500px}{iframe}