The most common and most likely answer to this crossword clue is the 7 letter word ON-SITE
I've seen this crossword clue in The Times
O
N
-
S
I
T
E
Buddy explains!
The straight part
We know that "at the scene" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case at the scene = on-site.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 ON-SITE mean?
ON-SITE adjective- On a particular site or in a particular building, as opposed to at a remote site or factory.