Huge sum, or one misrepresented? (8)
I believe the answer is:
enormous
'huge' is the definition.
('enormous' can be a synonym of 'huge')
'sum or one misrepresented?' is the wordplay.
'misrepresented?' is an anagram indicator.
'sum'+'or'+'one'='sumorone'
'sumorone' with letters rearranged gives 'ENORMOUS'.
(Other definitions for enormous that I've seen before include "Vast" , "Extremely large" , "Tremendous, gigantic" , "Huge, tremendous" , "Massive" .)