Vote against including Victory in the fleet (4)
I believe the answer is:
navy
'the fleet' is the definition.
(I've seen this in another clue)
'vote against including victory' is the wordplay.
'vote against' becomes 'nay' (I've seen this in another clue).
'including' is an insertion indicator.
'victory' becomes 'v'.
'nay' placed around 'v' is 'NAVY'.
'in' is the link.
(Other definitions for navy that I've seen before include "Colour; fighting force" , "Shade of the marine forces" , "A dark blue; service" , "Armed force" , "Fleet of ships" .)