The most common and most likely answer to this crossword clue is the 2 plus 2 plus 5 letter word ET TU BRUTE
I've seen this crossword clue in Financial Times
E
T
T
U
B
R
U
T
E
More clues leading to the result ET TU BRUTE
- Pudding habit will be curbed by summer in France? Famous last words
- Victim, leader of Empire, falling back, true to form — his Shakespearean cry?
- Speak right away about coarse remark from Senate floor
- You’ve let me down, putting rotten butter on butties regularly
- European races pig round hairpin — famous last words
- Recalled Hill routine ending in joke
- Reactionary state cut down monster, 17
- Final words to say briefly about beast
- In the end everyone’s behind rising — true, sadly, even you!
- Speak briefly about barbarian emperor’s final words
Buddy explains!
The straight part
We know that "Famous last words" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case famous last words = et tu brute.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.