Your screenshot properly embedded:

EDIT: OK, now that I see your screenshot I see you actually mean the word "(engineer)" and not the engineer for the track.
If you select all of those tracks that share a value, open the tag editor, and then go into tag inspector, you can delete that line from all of them at once in there without affecting anything else.
You'll also have to figure out how you introduced this error as part of your tagging procedure to prevent it from happening again.