Crossword Genius

Invest old money (5)

Ross

I believe the answer is:

crown

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

This might be a double definition.

'invest old' is the first definition.
'crown' can be an answer for 'invest' (crowning is a kind of investing). I'm not certain of the 'old' bit.

'money' is the second definition.
(I know that crown is a type of coin)

Can you help me to learn more?

(Other definitions for crown that I've seen before include "'Uneasy lies the head that wears a . . . . .'" , "Symbol of royalty" , "Royal headdress" , "Old coin; top of tree" , "peak" .)

I've seen this clue in the Sydney Morning Herald.
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