Bother in Corfu's sorted (4)
I believe the answer is:
fuss
'bother' is the definition.
(I know that bother can be written as fuss)
'in corfu's sorted' is the wordplay.
'in' indicates a hidden word.
'FUSS' is hidden in the letters of 'corfus sorted'.
(Other definitions for fuss that I've seen before include "Bustle; ado" , "Unnecessary agitation" , "Bother, ado" , "Agitation, maybe about nothing" , "Hoo-ha" .)