Holding down shift while selecting from a pop-up menu will deselect the choice the user has made, this may be an option for you.
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Just leave an empty line in the list of values.
thats perfect. actually that work. I made the blank value with an seperator between real values and the blank one:
Instead of delete sometimes I put a little cross x by the popup, not too obtrusive and takes up little space.
Or use the word "delete" or "clear" and then have a script trigger erase the field.