Crossword Genius

Swiss mathematician Leonhard (5)

Ross

I believe the answer is:

euler

'swiss mathematician leonhard' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for euler that I've seen before include "Eighteen-hole game" , "Leonhard -, C-eighteen Swiss mathematician" , "calculating foreigner" , "See fifty three across" , "Noted blind Swiss mathematician" .)

I've seen this clue in the Universal.
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