Private Reservation
noun
The lending gets cut right away when you make a private reservation.
貸し切り means reserving a space exclusively, like renting out a restaurant for a birthday party or chartering a bus, cruise, or jet.
It's the reading of 貸す and 切る put together. Know those two readings and you know this one as well. Sometimes you'll see this word as 貸切り or 貸切 as well.
この宿には、貸し切りの温泉があります。
This inn has a reserved hot spring.