The most common and most likely answer to this crossword clue is the 8 letter word RETORTED
I've seen this crossword clue in The Daily Telegraph
R
E
T
O
R
T
E
D
More clues leading to the result RETORTED
Buddy explains!

The straight part
We know that "Came back" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case came back = retorted.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 RETORTED mean?
RETORTED verb- To say something sharp or witty in answer to a remark or accusation.
- To make a remark which reverses an argument upon its originator; to return, as an argument, accusation, censure, or incivility.
- To bend or curve back.
- To throw back; to reverberate; to reflect.
- To heat in a retort.
- Interlaced