how can I override a partial from a plugin??? where does "render" look for partials?

Hi,

I'd like to override a particular partial from a plugin. In fact what
I'd really like to do is somehow "alias" it so I can effectively add
to the HTML that the partial creates. So I'd like to effectively do
something like create a bare partial in my own /apps/helpers
directory, the equivalent of alias out the plugin partial *.rhtml,
then call this but then ADD some extra HTML to the result. This way I
can still do plugin upgrades without having to worry about breaking my
override.

Any suggestions on how to do this?

Thanks in advance

PS. If this is just not possible, I'd be keen to hear about this too...thanks