Possible Clues:

• Tradename for an artificial sports pitch surface
• Plastic grass
• Synthetic playing surface
• RAF tutors bombing surface
• Artificial playing surface
• Four start going off such a surface
• Waves welcoming left-winger following a substitute on pitch?
• Tradename of an artificial surface for sports pitches
• Run in first of Arab white horses on special surface
• A pace into seawater, a departure from grass?