Definition of "apple sauce"

“You mean that I am now labelled not only as a loony in a general sort of way but also as a klept-whatever-it-is?” “Merely to your immediate circle now resident at Brinkley Court, sir.” “You keep saying that, and you must know it's the purest apple sauce. You don't really think the Creams will maintain a tactful reserve? They'll dine out on it for years. Returning to America, they'll spread the story from the rock-bound coasts of Maine to the Everglades of Florida, with the result that when I go over there again, keen looks will be shot at me at every house I go into and spoons counted before I leave.”

1960, P[elham] G[renville] Wodehouse, “VI and XXI”, in Jeeves in the Offing, London: Herbert Jenkins