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 Wall Street Journal and the USA Today.
I've seen this clue in The New York Times.
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