In short, the wily old Jew had the boy in his toils.
Mr. Fagin saw, with delight, that this tribute to his powers was no mere compliment, but that he had really impressed his recruit with a sense of his wily genius, which it was most important that he should entertain in the outset of their acquaintance.
There are no more uses of "wily" in the book.
Show samples from other sources
Yes, Amy is using a Madness song to give me a clue to my own freedom, if only I can decipher their wily, ska-infused codes.