Hold generous old admiral (4,6)

I believe the answer is:

full nelson

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

'hold' is the definition.
(I know that full nelson is a type of nelson)

'generous old admiral' is the wordplay.
'generous' becomes 'full'.
'old admiral' becomes 'nelson' (I've seen this before. I am not sure about the 'old' bit.).
'full'+'nelson'='FULL NELSON'

Can you help me to learn more?

(Another definition for full nelson that I've seen is " hold".)

I've seen this clue in The Irish Times.

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