The most common and most likely answer to this crossword clue is the 12 letter word CONSUMMATION
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Buddy explains!

The straight part
We know that "goal" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case goal = consummation.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does CONSUMMATION mean?
CONSUMMATION noun- The act of consummating, or the state of being consummated; the state of being completed; completion.
- The first act of sexual intercourse in a relationship, particularly the first such act following marriage.
- The achievement of perfection.
- Termination; the end (as of the world or of life).
- The date at which the mortgagor becomes contractually obligated to the mortgagee in a real estate transaction.