…you this one myself, in the only form in which well-bred people of our kind can communicate unpleasant things to each other: by letting you understand that I know you mean to see Ellen when you are in Washington, and are perhaps going there expressly for that purpose; and that, since you are sure to see her, I wish you to do so with my full and explicit approval—and to take the opportunity of letting her know what the course of conduct you have encouraged her in is likely to lead to.
There are no more uses of "explicit" in the book.
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She gave us explicit instructions.
We need to be more explicit so this will not be misunderstood.