The term 'Manila Envelope Closer' refers to a job that requires the use of a CLASP, which is a five-letter word. A Manila Envelope Closer is responsible for securely closing envelopes with a CLASP, typically made of metal or plastic. This job is often found in offices, where it is important to keep documents secure and confidential. The CLASP is used to ensure that the envelope remains closed until it reaches its intended recipient.