Hard to support narcissistic politician with ego in victory (7)
I believe the answer is:
triumph
'victory' is the definition.
('triumph' can be a synonym of 'victory')
'hard to support narcissistic politician with ego' is the wordplay.
'hard' becomes 'h'.
'to support' is a charade indicator (letters next to each other).
'narcissistic politician' becomes 'trump' (Donald Trump).
'with' indicates putting letters inside.
'ego' becomes 'i'.
'trump' enclosing 'i' is 'triump'.
'h' put after 'triump' is 'TRIUMPH'.
'in' is the link.
(Other definitions for triumph that I've seen before include "celebrate victory" , "Victory, great success" , "Exult in victory" , "Achieve complete victory" , "The exultation of victory" .)