It's a promise

IDO

["Here’s a helpful hint for the clue **\"It's a promise\"** with the answer **\"IDO\"**:\n\n*\"Wedding words often said at the altar.\"*\n\nThis hint:\n- Points to a common phrase associated with marriage vows.\n- Avoids directly repeating the clue or giving away the answer.\n- Guides the solver toward the context of promises in a wedding setting."]

The clue **"It's a promise"** leads to the answer **"IDO"** through a straightforward yet clever play on words. - **"I do"** is a common phrase used in wedding vows, where partners exchange promises of commitment. - The answer **"IDO"** is a direct representation of that phrase, written as a single word (without a space) to fit crossword conventions. - The clue hints at the idea of a promise, and "I do" is a well-known verbal promise in marriage ceremonies. Thus, the connection relies on recognizing the phrase **"I do"** as a promise and condensing it into the crossword-friendly format **"IDO."**