Francis —, second-in-command of the English fleet against the Spanish Armada in 1588 (5)

I believe the answer is:

drake

(Other definitions for drake that I've seen before include "First English captain to sail round the world" , "Captain of the Golden Hind, d. 1596" , "Male duck - circumnavigator" , "Nick" , "Male bird" .)

I've seen this clue in The Mirror.

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