I went exploring the xml components of a docx file and discovered the relevant setting in near the top of the settings.xml file.
w:clearFormatting="0" = don't show the Clear All option
w:clearFormatting="1" = show the Clear All option
So if you are comfortable editing xml files you could have a go at changing this setting on a copy of your affected document.
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Andrew Lockton
Chrysalis Design, Melbourne Australia
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