Possible Clues:

• One formally engaged in a diet?
• Old man or woman heretic securing Irishman as MP?
• The usual meal in a train upset diet expert
• Legislator flying Martian airplane
• The house by a group of architects for new public representative
• Average, struggling Inter Milan twice letting in a sitter?
• One of those in 2 down produced diet for Robin's maid starting off
• Owl, might one say: once an opponent of the king?
• Irishman visiting close relative, heretical legislator
• One having seat in AA, partner dishevelled Irishman brought in