A naval commander of singular vision (6)

I believe the answer is:

nelson

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'a naval commander' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

(Other definitions for nelson that I've seen before include "English admiral, mortally wounded at Trafalgar" , "'England expects' admiral" , "grip" , "18th century admiral" , "Sea-lord who loved Lady Hamilton" .)

I've seen this clue in the Evening Standard.

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