AZED refers to submitting a clue for the fifth word of the quotation. He says it has nine letters. In the ODQ the fifth word is one of three letters. Presumably he means the fifth word in the extract he presents in the puzzle - this is nine letters.
Yes, you are correct - the clue should be for the nine-letter fifth word of the nine-word quotation as provided by the misprinted letters; the quotation that appears in ODQ is longer, and is itself only part of the speech from which it is taken.
The 'mouse' in the wordplay for 9d is a black eye; the 'cant' in the wordplay for 6a is an unusual (well I wasn't aware of it!) meaning of the word, given under cant[2] in Chambers.