Crossword Genius

The very last drink - an object aimed at (6,3)

Ross

I believe the answer is:

bitter end

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'the very last' is the definition.
The answer and definition can be both related to time as well as being singular nouns.
Maybe there's a link between them I don't understand?

'drink an object aimed at' is the wordplay.
'drink' becomes 'bitter' (bitter is a kind of drink).
'an object aimed at' becomes 'end' (I can't explain this - if you can you should believe this answer much more).
'bitter'+'end'='BITTER END'

Can you help me to learn more?

(Other definitions for bitter end that I've seen before include "Losers may persevere to it" , "Limit of one's resources" .)

I've seen this clue in the Sydney Morning Herald.
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