Crossword Genius

England's highest military man? (6)

Ross

I believe the answer is:

nelson

'military man?' is the definition.
(Lord Nelson)

I cannot understand how the remainder of the clue works.

(Other definitions for nelson that I've seen before include "northern town" , "... famous admiral" , "Naval hero, d. 21 October 1805" , "Lady Hamilton's admiral lover" , "'Horatio ..., English admiral (6)'" .)

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