Vote for the half bottle that has everything (6)
I believe the answer is:
ballot
'vote' is the definition.
(balloting is a kind of voting)
'the half bottle that has everything' is the wordplay.
'the half' means to take half the letters.
'that has' is an insertion indicator.
'everything' becomes 'all' (I've seen this before).
'bottle' with half the letters taken is 'bot'.
'bot' going around 'all' is 'BALLOT'.
'for' is the link.
(Other definitions for ballot that I've seen before include "Poll" , "Vote or suffrage" , "Document listing voting alternatives" , "Secret vote" , "Single or collective vote" .)