Amazed by a dishonest arrangement (10)
I believe the answer is:
astonished
'amazed' is the definition.
('astonish' can be a synonym of 'amaze')
'by a dishonest arrangement' is the wordplay.
'by' says to put letters next to each other.
'arrangement' is an anagram indicator.
'dishonest' is an anagram of 'stonished'.
'a' next to 'stonished' is 'ASTONISHED'.
(Other definitions for astonished that I've seen before include "Greatly surprised" , "given a bombshell?" , "lost for words" , "Gobsmacked" , "Amazed" .)