What is closed on a clipper?

Could you please clarify what you mean by "closed on a clipper"? Are you referring to a specific type of clipper tool or machine, or perhaps a metaphorical usage of the term? If we're talking about a physical clipper, such as those used for haircutting or gardening, typically there isn't anything that's "closed" on them in the sense of a physical barrier or mechanism. Perhaps you're asking about a specific feature or part of the clipper that might be closed or closed off? If so, could you provide more context or clarify your question further? Additionally, if you're referring to a metaphorical usage, could you elaborate on the context in which the phrase "closed on a clipper" is being used? This will help me provide a more accurate and relevant response.