Crossword Genius

Nelson laid out with injured arm (7)

Ross

I believe the answer is:

admiral

I'm a little stuck... Click here to teach me more about this clue!

This clue might be a double definition.

'nelson' is the first definition.
Both the definition and answer are singular nouns.
Maybe there's a link between them I don't understand?

'laid out with injured arm' is the second definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

Can you help me to learn more?

(Other definitions for admiral that I've seen before include "Brightly coloured butterfly" , "[NELSON] perhaps" , "Naval chief" , "Chief commander of fleet" , "Highest ranking naval officer" .)

I've seen this clue in The Sun.
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