Possible Clues:

• Meal -- father tucks into what's left
• Others eating old man’s food
• Meal has gone by rouge lips
• Lunch, say
• Possibly a lunch break when office assistant's kept in
• Spread to chow down on
• Meal with father, splitting leftovers
• Something to eat cooked at supper, cut up
• Restaurant offering
• Break to take secretary for dinner, say