Promoters of commercial port to secure millions (5)

I believe the answer is:

admen

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'promoters' is the definition.

'commercial port to secure millions' is the wordplay.
'commercial port' becomes 'aden' (port in Yemen. I am not sure about the 'commercial' bit.).
'to secure' means one lot of letters goes inside another (inserted letters are secured inside).
'millions' becomes 'm' (abbreviation).
'aden' enclosing 'm' is 'ADMEN'.

'of' is the link.

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I've seen this clue in The Sunday Times.

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