Investor takes one on to get ingots (7)
I believe the answer is:
bullion
'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" .)