Concerned current setter's upset by editor (10)
I believe the answer is:
interested
'concerned' is the definition.
('interested' can be similar in meaning to 'concerned')
'current setter's upset by editor' is the wordplay.
'current' becomes 'in' (I've seen this in other clues**).
'upset by' indicates anagramming the letters.
'editor' becomes 'ed'.
'setter' with letters rearranged gives 'terest'.
'in'+'terest'+'ed'='INTERESTED'
(Other definitions for interested that I've seen before include "Not impartial" , "Partisan" , "Fascinated" , "Attentive" , "Concerned" .)