The most common and most likely answer to this crossword clue is the 10 letter word JOURNALIST
I've seen this crossword clue in The Sunday Telegraph
J
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More clues leading to the result JOURNALIST
Buddy explains!

The straight part
We know that "reporter" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case reporter = journalist.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 JOURNALIST mean?
JOURNALIST noun- The keeper of a personal journal, who writes in it regularly.
- One whose occupation is journalism, originally only writing in the printed press.
- A reporter, who professionally does living reporting on news and current events.