Crossword Genius

Grissom of NASA (3)

Ross

I believe the answer is:

gus

'grissom of nasa' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for gus that I've seen before include "Augustus (dim.)" , "T. S. Eliot's theatre cat" .)

I've seen this clue in the L.A. Times Daily and the LA Times.
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