Full Idea
Frege should be criticised for using the term 'sense' in two senses. He takes the sense of a designator to be its meaning; and he also takes it to be the way its reference is determined. …They correspond to two ordinary uses of 'definition'.
Gist of Idea
Frege's 'sense' is ambiguous, between the meaning of a designator, and how it fixes reference
Source
comment on Gottlob Frege (On Sense and Reference [1892]) by Saul A. Kripke - Naming and Necessity lectures Lecture 1
Book Reference
Kripke,Saul: 'Naming and Necessity' [Blackwell 1980], p.59
A Reaction
Stalnaker quotes this, but seems unconvinced that Frege is guilty. If the 'meaning' largely consists of a way of determining a reference, Frege would be in the clear.