You can apply a margin to an item within the ListViewItem itself like below, which will stop the cut off. Alternatively you could use a ContentTemplate as the second example.
Example 1:
<!-- language: lang-xml -->
<ListView>
<ListViewItem>
<TextBlock Text="Hello World" Margin="5,0,0,0"/>
</ListViewItem>
</ListView>
Example 2:
<!-- language: lang-xml -->
<ListView>
<ListViewItem Content="Hello World!">
<ListViewItem.ContentTemplate>
<DataTemplate>
<TextBlock Text="{Binding}" Margin="5,0,0,0"/>
</DataTemplate>
</ListViewItem.ContentTemplate>
</ListViewItem>
</ListView>