Investor takes one on to get ingots (7)

I believe the answer is:

bullion

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'get ingots' is the definition.
I can't tell whether this definition defines the answer.

'investor takes one on' is the wordplay.
'investor' becomes 'bull' (bull is a kind of investor).
'takes' means one lot of letters go next to another.
'one' becomes 'I' (Roman numeral).
'bull'+'i'+'on'='BULLION'

'to' acts as a link.

Can you help me to learn more?

(Other definitions for bullion that I've seen before include "Gold or silver in bulk" , "Gold or silver in bars or ingots" , "expensive bars" , "Bars of precious metal" , "Precious metal in mass" .)

I've seen this clue in The Mirror.

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