Disaffected editor drinking rum (9)
I believe the answer is:
estranged
'disaffected' is the definition.
('estrange' can be a synonym of 'disaffect')
'editor drinking rum' is the wordplay.
'editor' becomes 'ed'.
'drinking' indicates putting letters inside.
'rum' becomes 'strange' ('strange' can be a synonym of 'rum'**).
'ed' going around 'strange' is 'ESTRANGED'.
(Other definitions for estranged that I've seen before include "Alienated, disaffected" , "Having become unfriendly or alienated" , "Sad regent (anag) - disaffected" , "A nerd gets (anag) - separated" , "Cut off" .)