Result of guarantee Republican's conceded (5)
I believe the answer is:
ensue
'result' is the definition.
('ensue' can be a synonym of 'result')
'guarantee republican's conceded' is the wordplay.
'guarantee' becomes 'ensure' ('ensure' can be a synonym of 'guarantee').
'republican' becomes 'r' (abbreviation).
'conceded' indicates named letters should be taken away.
'ensure' with 'r' taken out is 'ENSUE'.
'of' acts as a link.
(Other definitions for ensue that I've seen before include "Happen - to come later" , "Happen or come about as consequence" , "Follow afterwards" , "Happen as a result, follow ( 5)" , "Follow as a consequence" .)