The crossword solution for the term 'PARCEL'S PARTNER' is PART, which is a four-letter word. The word 'PART' can refer to a portion of something, or it can refer to a person who shares a relationship with another person. In this case, the term 'PARCEL'S PARTNER' refers to the partner of a parcel, which could be a package or shipment that is sent from one place to another. The partner of the parcel would be the recipient of the package, who is responsible for receiving and taking ownership of the parcel.