To be for you' is a phrase that expresses an intention to do something for someone else. It is often used as a way to show kindness and generosity, as well as to express love and care. The phrase can also be used to indicate a willingness to help someone out or to make a sacrifice for them. The three-letter solution to this crossword puzzle is 'ARE, ' which is the conjugated form of the verb 'to be.' This verb is used in the phrase 'to be for you, ' indicating that the speaker is willing to do something for the other person.