Fight expected to be given approval ultimately (4)
I believe the answer is:
duel
'fight' is the definition.
(duel is a kind of fight)
'expected to be given approval ultimately' is the wordplay.
'expected' becomes 'due' (I've seen this before).
'to be given' means one lot of letters go next to another.
'ultimately' suggests the final letters.
The final letter of 'approval' is 'l'.
'due'+'l'='DUEL'
(Other definitions for duel that I've seen before include "Prearranged fight with deadly weapons between two people" , "Single combat" , "Fight between two persons" , "Combat to settle a row" , "Prearranged engagement" .)