Philosopher of note made-up ethics covering Zoroastrianism primarily for the foundation (9)

I believe the answer is:

nietzsche

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'philosopher' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

(Other definitions for nietzsche that I've seen before include "German poet" , "German philosopher, wrote Beyond Good and Evil" , "German philosopher, d. 1900, noted for his concept of superman" , "Friedrich -, nineteenth century German philosopher" , "Influential German existentialist philosopher" .)

I've seen this clue in the Irish Times.

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