Crossword Genius

An amount (7)

Ross

I believe the answer is:

quantum

'an amount' is the definition.
('quantum' can be a synonym of 'amount')

This is the entire clue.

(Other definitions for quantum that I've seen before include "Smallest possible amount (eg of energy) - large and sudden" , "Amount - measure" , "one tiny jump for a physicist" , "Small discrete amount" , "... of Solace, James Bond film" .)

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