Possible Clues:

• Words on an arrow-shaped sign
• & thirty four across Stiff Little Fingers' first Top twenty hit
• Moving in a single direction only
• This street is single-directional
• There's no going back on it
• O, that's fresh! Yes, but you can't have it both ways
• Where one cannot go to as well as fro
• O, it's fresh. Ay, you'll get no return from it (3-3)
• Not allowing reverse motion
• Single-directional like some streets