Related Clues:

• Put aside for later consideration
• Put aside for the present, plan or book
• Arrange for in advance, a seat perhaps
• Reverse into back-up store
• Put aside for later consideration - in cupboard?
• Reveres so as to retain
• Put aside for the present - on a ledge?
• Hold back or set aside for future use
• Put aside for special use
• Retain for future use
• Book to act once more like a 25 down, perhaps
• What 16 across may do once more by the book?
• That's the way to be a waiter again, but keep it to yourself
• The twelfth man
• Wait again, perhaps, and do it by the book