In the control panel, is it possible to only show a field when editing a single particular entry using JS/jQuery?
It's a matrix field, in case this makes any difference.
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Updated: A Matrix field will still have an Instructions field in its Channel Fields definition, and that Instructions field can store HTML or script tags that will be processed when the page is rendered. You'll just need to View Source to see what the HTML is that contains the field, and hide it based on that HTML reference using jQuery.