John —, explorer (5)

I believe the answer is:

cabot

(Other definitions for cabot that I've seen before include "Sebastian & John -, early navigators" , "famous explorer" , "Italian leader of the 1497 English expedition to the east coast of today's Canada" , "John (Giovanni) -, navigator, explored N. America" , "One of two explorers" .)

I've seen this clue in The Times.

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