Clue: Far from pure setter perhaps outlining principles (we hear) in academic cruciverbalism, named Ximenes (7)
Answer: MACNUTT
Explanation: Definition: Ximenes
A[cademic] C[ruciverbalism] N[amed] ("principles (we hear)" being the principal letters) in MUTT (a mongrel, so not a pure Setter (say)). Ximenes was the pseudonym of Derrick Somerset Macnutt, successor of Torquemada in *The Observer* and predecessor of Azed.