Plone doesn’t seem to give news items a table of content option as pages have, so it seems you can force a TOC in news items.  In the html editor enter the following code and see if this doesn’t add a table of contents for you:

<dl class="portlet toc" id="document-toc"><dt class="portletHeader">Table of Contents</dt><dd class="portletItem"><ol class="TOC1Digit"></ol></dd></dl>

Caveat: If this code is added to a news item that appears on a blogroll with other news items THEN the table of contents generates links for EVERY article. Plone is not the smartest CMS in the bunch, and definitely not the brightest.  But it does win my least favorite award.