The most common and most likely answer to this crossword clue is the 6 letter word FINALE
F
I
N
A
L
E
More clues leading to the result FINALE
- A line in very good last act
- Source of flavour in beer – the culminating touch
- The end of almost great drink
- Close dossier about an uprising
- Going west, panache provided conclusion
- One comes up in line for closing number
- End with bit of fish and beer
- End with almost everything stopping dry
- Penalty to pay, about a pound in the end
- Conclusion when penalty crosses a line
Buddy explains!

The straight part
We know that "last act" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case last act = finale.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 FINALE mean?
FINALE noun- The grand end of something, especially a show or piece of music.
- The chronological conclusion of a series of narrative works.