Balkan returning from macabre seance (4)
I believe the answer is:
serb
'balkan' is the definition.
'returning from macabre seance' is the wordplay.
'returning' shows that the letters should be reversed in order.
'from' indicates a hidden word.
'bres' is hidden in the letters of 'macabre seance'.
'bres' back-to-front is 'SERB'.
(Other definitions for serb that I've seen before include "One from Belgrade" , "A European national" , "Someone from Belgrade?" , "Native of the Balkans" , "Eg, native of Belgrade" .)