Disaffected editor importing rum (9)
I believe the answer is:
estranged
'disaffected' is the definition.
('estrange' can be a synonym of 'disaffect')
'editor importing rum' is the wordplay.
'editor' becomes 'ed' (abbreviation).
'importing' indicates putting letters inside.
'rum' becomes 'strange' (synonyms).
'ed' enclosing 'strange' is 'ESTRANGED'.
(Other definitions for estranged that I've seen before include "Having become unfriendly or alienated" , "Alienated, disaffected" , "A nerd gets (anag) - separated" , "no longer friendly" , "Split" .)