The most common and most likely answer to this crossword clue is the 4 letter word BREN
I've seen this crossword clue in Financial Times
B
R
E
N
Buddy explains!

The straight part
We know that "shot with it" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case shot with it = bren.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 BREN mean?
BREN verb- To burn (to set ablaze).