Crossword Genius

Ready to meet Nelson at sea (2,4,6)

Ross

I believe the answer is:

on ones mettle

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'ready' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'to meet nelson at sea' is the wordplay.
'at sea' is an anagram indicator.
'to'+'meet'+'nelson'='tomeetnelson'
'tomeetnelson' is an anagram of 'ON ONES METTLE'.

Can you help me to learn more?

(Another definition for on ones mettle that I've seen is " Challenged".)

I've seen this clue in The Everyman puzzle in The Observer.
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