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How to interpret old money (7)

Ross

I believe the answer is:

expound

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'how to interpret' is the definition.
I can't judge whether this definition defines the answer.

'old money' is the wordplay.
'old' becomes 'ex' (prefix meaning former or onetime).
'money' becomes 'pound' (pound sterling).
'ex'+'pound'='EXPOUND'

Can you help me to learn more?

(Other definitions for expound that I've seen before include "Upend ox (anag)" , "Explain and interpret" , "Elucidate" , "Explain meaning in detail" , "Set forth, explain in detail" .)

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