Just like that, English banished from the United States (4)
I believe the answer is:
thus
'just like that' is the definition.
(thesaurus)
'english banished from the united states' is the wordplay.
'english' becomes 'e' (abbreviation).
'banished from' is a deletion indicator.
'united states' becomes 'US' (abbreviation for the United States).
'the' with 'e' removed is 'th'.
'th'+'us'='THUS'
(Other definitions for thus that I've seen before include "'So, therefore (4)'" , "Shut (anag.)" , "Consequently" , "Like so" , "Therefore, hence" .)