The most common and most likely answer to this crossword clue is the 7 letter word BRAVADO
I've seen this crossword clue in The Times
B
R
A
V
A
D
O
More clues leading to the result BRAVADO
- See trouble with British artist fronting game show?
- Swagger shown by upcoming lawyer with excellent case
- Showing off poster during what follows 22
- Swag stuffed aboard transports close to Kiev
- Well performed trick produces a show of confidence
- Nowadays, character from Nato goes around boasting
- Pretentious display of well done party
- Swagger of female going both ways during bedroom party
- Swaggering hitman accepting promotion
- Showing off female’s excellent fare
Buddy explains!

The straight part
We know that "just empty talk?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case just empty talk? = bravado.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 BRAVADO mean?
BRAVADO noun- A swaggering show of defiance or courage.
- A false show of courage.
- A swaggerer; a braggart.
- To swagger; to brag.