Out East, arson upsets this European (6)
I believe the answer is:
senora
'upsets this european' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'out east arson' is the wordplay.
'out' indicates an anagram.
'east' becomes 'e' (abbreviation).
'e'+'arson'='earson'
'earson' anagrammed gives 'SENORA'.
Can you help me to learn more?
(Other definitions for senora that I've seen before include "Spanish title" , "Spanish lady within reason" , "Reason with a Spanish woman, probably married" , "woman from Barcelona" , "Lady of Spain" .)