The most common and most likely answer to this crossword clue is the 3 plus 4 letter word SAD CASE
I've seen this crossword clue in Financial Times
S
A
D
C
A
S
E
More clues leading to the result SAD CASE
Buddy explains!
The straight part
We know that "he’s a pathetic sort" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case he’s a pathetic sort = sad case.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.