Crossword Genius

Greek characters returned amount (3)

Ross

I believe the answer is:

sum

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'amount' is the definition.
(synonyms)

I cannot understand how the rest of the clue works.

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(Other definitions for sum that I've seen before include "Arithmetical problem" , "See 25" , "Quantity of money" , "Add together" , "pupils find it a problem" .)

I've seen this clue in The Sun.
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