Crossword Genius

All or just part, say (3)

Ross

I believe the answer is:

sum

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

'part say' is the wordplay.
'part' becomes 'some' (I've seen this before).
'say' shows a homophone (sound like).
'some' is a homophone of 'SUM'.

'or just' acts as a link.

(Other definitions for sum that I've seen before include "Mathematical problem" , "Quantity obtained by addition" , "Whole" , "Quantity of money" , "pupils find it a problem" .)

I've seen this clue in The Mirror.
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