The most common and most likely answer to this crossword clue is the 11 letter word COMPUNCTION
C
O
M
P
U
N
C
T
I
O
N
Buddy explains!

The straight part
We know that "feeling sorry for" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case feeling sorry for = compunction.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 COMPUNCTION mean?
COMPUNCTION noun- A pricking of conscience or a feeling of regret, especially one which is slight or fleeting.