No judge on America's left (7)
I believe the answer is:
refusal
'no' is the definition.
(thesaurus)
'judge on america's left' is the wordplay.
'judge' becomes 'ref'.
'on' is a charade indicator (letters next to each other).
'america' becomes 'usa' ('U.S.A.' can be a synonym of 'america'**).
'left' becomes 'l' (common abbreviation).
'ref'+'usa'+'l'='REFUSAL'
(Other definitions for refusal that I've seen before include "problem for a show-jumper" , "Rejection of an offer" , "Act of declining to take or accept something" , "Dissent" , "Chance to decline" .)