Crossword Genius

Old pro with large amount to obtain a marsupial (7)

Ross

I believe the answer is:

opossum

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'a marsupial' is the definition.
(opossum is a kind of marsupial)

'old pro with large amount' is the wordplay.
'old pro' becomes 'op' (this could be a standard abbreviation I've not previously seen).
'with' means one lot of letters go next to another.
'large' becomes 'os'.
'amount' becomes 'sum' (synonyms).
'op'+'os'+'sum'='OPOSSUM'

'to obtain' acts as a link.

Can you help me to learn more?

(Other definitions for opossum that I've seen before include "Tree climber" , "US marsupial" , "American native" , "Small Australian marsupial" , "Small arboreal marsupial" .)

I've seen this clue in The Hindu.
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