Old sailor with an heir (5)

I believe the answer is:

anson

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'old sailor' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'with an heir' is the wordplay.
'with' is a charade indicator (letters next to each other).
'heir' becomes 'son' (I've seen this in another clue).
'an' next to 'son' is 'ANSON'.

Can you help me to learn more?

(Another definition for anson that I've seen is " George ____, circumnavigator and admiral, 1697-1762".)

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