I can't find any obvious way to do this. I'd rather remove an announcement once it's no longer valid than post a second one explaining that the problem (or whatever) is resolved. I can't find a way to do that.
You remove announcements in the same place where they are added. To remove an announcement from the portal, if you navigate to the portal and then click on the Customise tab (should be on the right hand side) then a little side panel should show up. Click on Portal Announcement and this is where you can remove the title and text of the announcement, which will remove it from the portal
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