Simple xslt that does an identity copy but removes one element.

Simple xslt

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
    version="1.0">
    
    <xsl:template match="node() | @*">
        <xsl:copy>
            <xsl:apply-templates select="node() | @*"/>
        </xsl:copy>
    </xsl:template>
    
    <xsl:template match="thingToDiscard"/> <!-- Add a namespace if necessary!!! -->
    
    
</xsl:stylesheet>