Crossword Genius

All's not all we hear (3)

Ross

I believe the answer is:

sum

'all's' is the definition.
(I've seen this before)

'not all we hear' is the wordplay.
'not all' becomes 'some' ('some' is the opposite to 'all').
'we hear' shows a homophone (sound like).
'some' sounds like 'SUM'.

(Other definitions for sum that I've seen before include "Amount of money; total" , "Amount, aggregate" , "Whole" , "Amount, of money say" , "All one has" .)

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