Not exactly making the cell a link, but the table itself. I use this as a button in e-mails, giving me div-like controls.
<a href="https://www.foo.bar" target="_blank" style="color: white; font-weight: bolder; text-decoration: none;">
<table style="margin-left: auto; margin-right: auto;" align="center">
<tr>
<td style="padding: 20px; height: 60px;" bgcolor="#00b389">Go to Foo Bar</td>
</tr>
</table>
</a>
_x000D_