Excessively upset? Only at Brexit! (12)
I believe the answer is:
exorbitantly
'excessively' is the definition.
(thesaurus)
'upset? only at brexit' is the wordplay.
'upset?' indicates an anagram (I've seen 'upsets' mean this).
'only'+'at'+'brexit'='onlyatbrexit'
'onlyatbrexit' is an anagram of 'EXORBITANTLY'.
I've seen this clue in The Independent.
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