Crossword Genius

He might feign ignorance of Post Office's total (6)

Ross

I believe the answer is:

possum

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'he might feign ignorance' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'post office's total' is the wordplay.
'post office's' becomes 'po's' (abbreviation).
'total' becomes 'sum' (synonyms).
'pos'+'sum'='POSSUM'

'of' is the link.

Can you help me to learn more?

(Other definitions for possum that I've seen before include "Small animal with a pouch" , "American marsupial (that plays dead?)" , "Australian marsupial with dense fur and a long tail" , "The Australasian phalanger" , "Small furry Australian marsupial" .)

I've seen this clue in The Globe and Mail.
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