Crossword Genius

Sum to deposit, rising (3,2)

Ross

I believe the answer is:

tot up

'sum' is the definition.
('tot up' can be a synonym of 'sum')

'to deposit rising' is the wordplay.
'deposit' becomes 'put' (I've seen this in other clues).
'rising' says the letters should be written backwards (going up in a down clue).
'put' in reverse letter order is 'tup'.
'to'+'tup'='TOT UP'

(Other definitions for tot up that I've seen before include "Determine the sum of" , "Add together (driving offences)" , "Reckon" , "Tally" , "Count" .)

I've seen this clue in The Independent.
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