What does the cryptic crossword clue "Mathematician's irrational measuring tool initially rejected (5)" mean?

The definition is "Mathematician". The wordplay uses a charade (building blocks). E (synonym="irrational number") + ULER (synonym="measuring tool") = EULER; definition: "Mathematician's" The answer is EULER.

Mathematician's irrational measuring tool initially rejected (5)

Independent Cryptic #11957 | 22 Across | 2025-02-04 flower

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