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The central point of the theory of descriptions was that a phrase may contribute to the meaning of a sentence without having any meaning at all in isolation. Of this, in the case of descriptions, there is precise proof: If 'the author of Waverley' meant anything other than 'Scott', 'Scott is the author of Waverley' would be false, which it is not. If 'the author of Waverley' meant 'Scott', 'Scott is the author of Waverley' would be a tautology, which it is not. Therefore, 'the author of Waverley' means neither 'Scott' nor anything else - i.e. ‘the author of Waverley' means nothing, Q.E.D.
Source: My Philosophical Development, 1959, by Bertrand Russell
More info.: https://russell-j.com/beginner/BR_MPD_07-150.HTM