Law rejected by devious letters in America’s financial hub (4,6)
I believe the answer is:
wall street
'financial hub' is the definition.
(I've seen this before)
'law rejected by devious letters' is the wordplay.
'rejected' says the letters should be written in reverse.
'by' is a charade indicator (letters next to each other).
'devious' is an anagram indicator.
'law' in reverse letter order is 'wal'.
'letters' with letters rearranged gives 'lstreet'.
'wal'+'lstreet'='WALL STREET'
'in america's' acts as a link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for wall street that I've seen before include "part of Manhattan" , "US financial centre" , "New York finance centre" , "NY financial area" , "Location of US stock exchange" .)