Hero who, partly disarmed, possessed unique vision (6)

I believe the answer is:

nelson

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This clue might be a double definition.

'hero who partly disarmed possessed unique' is the first definition.
'nelson' can be an answer for 'hero' (I've seen this before). I am unsure of the rest of the definition.

'vision' is the second definition.
(I know that Nelson is a fictional human)

Can you help me to learn more?

(Other definitions for nelson that I've seen before include "Hero of Trafalgar Square" , "Sailor" , "Naval hero, d. 21 October 1805" , "Admiral on a column" , "Lancashire town" .)

I've seen this clue in the Evening Standard.

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