I would solve this by "hardcoding" your Gallery link - go to cleancut options > Mainpage options and select "Widget" or HTML for the third column. Then create an text widget or edit index.php with the text and the preview picture/fullwidth picture (upload it to your media libary) you would like to use. Afterwards delete the preview picture/fullwidth picture from your gallery, so it won't appear there.
Code for text widget:
<a href="http://coreyminorsmith.com/?page_id=13" title="" ><img src="http://coreyminorsmith.com/wp-content/themes/display/framework/includes/timthumb.php?src=/wp-content/uploads/2010/08/cmssmpic2.jpg&h=124&w=280&zc=1" alt="" /></a><h3><a href="http://coreyminorsmith.com/?page_id=13">Photo Gallery</a></h3>
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The Dude