Edit your clips as you would the newspaper, or a section. Include only your best. It's better to submit one fewer clip than they ask than one you don't want to talk about. Examine your leads. Leave it out.
Someone is likely to pucker up at the lead and go no further.
After you've edited for good leads, read over the finalists. They should be. You don't want to inadvertently send six clips in which three of the leads sound alike. One, at the most, and only if it's on a project or a big, breaking news story where you played lead rewrite. Better to have none.