Possible Clues:

• In the way to get to greet a number
• Number entering illegally, not showing name
• Treeing (anag.)
• Figure Bury is outside, for example
• Takes a number to make it green
• Number, for example, in between one and three?
• A number for example, trapped in place underground
• A whole unit
• Goalie gutted when Milan team's 6 down
• A number is needed to make it green