____ 1 was the USA's first satellite, launched in 1958 (8)

I believe the answer is:

explorer

(Other definitions for explorer that I've seen before include "old satellite" , "Eg, Livingstone, Park" , "Adventurer in little-known regions" , "It helps to search" , "Traveller in unknown parts" .)

I've seen this clue in The Times.

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