Possible Clues:

• Pasture activity
• Eating grass, as animals do
• Cattle activity
• Sampling the smorgasbord
• Eating grass in a meadow
• Eating grass
• ... continually eating nan, cut and served with relish
• Cows might be looking round rear of tractor
• Behaving like sheep staring fixedly across river
• Scrape this from 15 down