Unclued, the first three letters of CIAO are an Italian abbreviation (Italian company); the last letter is a medieval Roman numeral for 11.
Meursault, we may not be 'on the same page'. The quotation that explains the treatment of the ten answers is in ODQ, and is the only quotation from that author. But we are not given that author, we are given a work by another author that contains the quotation. My point is that the passage from the given work that contains the thematic quotation is not in ODQ (unless it has been added to later editions), hence the need for Google.
Topaz, in addition to your points, 5d and 6d both contain examples of the thematic word. Admittedly they do not appear in the Chambers entry for the thematic word, but they are still very obvious examples.