First American to orbit the Earth (5)
'first american to orbit the earth' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for glenn that I've seen before include "John --, pioneer US astronaut" , "John -, first American to orbit the earth" , "John -, first US astronaut to orbit the earth" .)
I've seen this clue in the USA Today and The Wall Street Journal.
I've seen this clue in The New York Times.
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