Without hesitation, fate has sealed ex-president as initiator of hatred (4,1,4)
I believe the answer is:
like a shot
'without hesitation' is the definition.
(I've seen this before)
'fate has sealed ex-president as initiator of hatred' is the wordplay.
'fate' becomes 'lot' (synonyms).
'has sealed' indicates putting letters inside.
'ex-president' becomes 'ike' (nickname of Dwight Eisenhower).
'initiator of' says to take the initial letters.
The initial letter of 'hatred' is 'h'.
'ike'+'as'+'h'='ikeash'
'lot' placed around 'ikeash' is 'LIKE A SHOT'.
(Other definitions for like a shot that I've seen before include "Instantly" , "Enjoy field sports" , "looking round, in field event?" , "'Pronto!'" , "straightaway?" .)