Crossword Genius

Astronomer Carl ____ (5)

Ross

I believe the answer is:

sagan

'astronomer carl' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for sagan that I've seen before include "French authoress" , "Author of Bonjour Tristesse, d. 2004" , "US scientist" , "Astronomer" , "French author" .)

I've seen this clue in The Wall Street Journal, The Star Tribune, the Newsday and the King Feature Syndicate.
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