| Answer | Crossword Clue |
|---|---|
| ITSOPEN | Response to a knock |
| WHOCANITBE | Response to a knock |
| ENTER | Response to a knock |
| WHOCOULDTHATBE | Response to a knock |
| ITSOPEN | Friendly response to a knock |
| COMEIN | Response to a knock, maybe |
| ITSOPEN | Response to a knock, perhaps |
| ENTER | Formal response to a knock |
| ISIT | "Who ...?" (Response to a knock) |
| IMUP | Response to a morning knock |
| IMNOTHERE | Paradoxical response to a door knock |
| WHOISIT | Response to a knock on the door. |
| WHODAT | Slangy response to a knock at the door |
| WHOS | Start of a "Knock, knock" response |
