Possible Clues:

• Nest-builder hoarding green food
• Eccentric end boxes in men making complaint
• Something nourishing
• Food, support
• Food from Portugal I mentioned
• Food that's green fed to insect
• For nourishment, a fruit, not forgetting the core
• Setter on slipping lead wags tail around chow
• Food intake's initially lowered through illness
• Worker entertaining one of The Greens with old-fashioned fare