I'm using a specific field in my flexinodes to act as a teaser and it's displaying fine on my site. The problem comes with RSS feeds. When specifying to add the teaser to RSS feeds generated by Drupal, the teaser automatically generated for the node is added to the description field in the RSS feed and contains a lot of unwanted HTML, and a read more link.

Example of HTML if I select a field to be added to shown in the teaser;
<div class="flexinode-body flexinode-2"><div class="flexinode-textarea-42"><div class="form-item">
<label>Standfirst: </label>
<p>This is the specific flexinode field I've checked to be placed in the teaser</p>

</div>
</div><div><p><a href="http://cosmos/node/343">read more</a></p>

If I select no field to be shown in teaser;
<div class="flexinode-body flexinode-2"></div><p><a href="http://cosmos/node/343">read more</a></p>

Ho do I remove this HTML so that my teaser looks like;

With a field selected to be shown in teaser;

This is the specific flexinode field I've checked to be placed in the teaser

If I select no field to be shown in teaser;
(nothing)

Any help is greatfully accepted.