The most common and most likely answer to this crossword clue is the 2 plus 6 letter word NO RETURN
I've seen this crossword clue in The Guardian
N
O
R
E
T
U
R
N
Buddy explains!
The straight part
We know that "Scored an ace/You must go on from this point" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case scored an ace/you must go on from this point = no return.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.