You could conditionally change the word "Clear" to an empty string "" for that form, using CONTEXT("View") and the UX>Localization settings. But I think the button will still be there if they click the blank area where the text would be.
Are the users allowed to change the Enum once a value has been set? If not, maybe use Editble_If ISBLANK([_THIS]), and that should hide the Clear button.
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