Total or part consumed (3)

I believe the answer is:

sum

'total' is the definition.
(synonyms)

'part consumed' is the wordplay.
'part' indicates the answer is hidden within the clue.
'SUM' can be found hidden inside 'consumed'.

'or' acts as a link.

(Other definitions for sum that I've seen before include "Arithmetic calculation" , "Whole" , "Total; problem" , "Amount, aggregate" , "Amount of money; add" .)

I've seen this clue in the Sydney Morning Herald.

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