Old sailor with an heir (5)

I believe the answer is:

anson

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'old sailor' is the definition.
I know nothing about this answer so I can't tell whether this works.

'with an heir' is the wordplay.
'with' means one lot of letters go next to another.
'heir' becomes 'son' (I've seen this before).
'an'+'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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