Crossword Genius

No ordinary seaman (7)

Ross

I believe the answer is:

admiral

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This might be a double definition.

'no ordinary' is the first definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps there's a link between them I don't understand?

'seaman' is the second definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps there's an association between them I don't understand?

Can you help me to learn more?

(Other definitions for admiral that I've seen before include "Highest ranking naval officer" , "Chief commander of fleet" , "Naval officer of high rank" , "Supreme naval commander" , "Naval chief" .)

I've seen this clue in the Evening Standard.
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