You have to edit skin.xml in the skin you use like this
<screen name="InfoBarSummary" position="0,0" size="132,64">
<widget font="Regular;50" halign="Center" position="1,1" render="Label" size="130,62" source="global.CurrentTime" valign="top">
<convert type="ClockToText">Format:%H:%M</convert>
</widget>
Remove the other lines you have under InfoBarSummary