The most common and most likely answer to this crossword clue is the 10 letter word PARDONABLE
I've seen this crossword clue in The Sunday Telegraph
P
A
R
D
O
N
A
B
L
E
More clues leading to the result PARDONABLE
- Going into a Bible story, teacher is not to be condemned
- In lesson, teacher not too serious?
- Not too serious … then birdie perhaps unlikely to swallow last of poison?
- Story about fellow can be forgiven
- Venial story about Pasquale, perhaps?
- Fellow in moral tale is not beyond redemption
- Instructive tale about academic not beyond forgiveness
- That may be forgiven in a story involving a Mafia boss
- Bible story about fellow deserving forgiveness
- Story about teacher worth forgiving
Buddy explains!

The straight part
We know that "worth forgiving" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case worth forgiving = pardonable.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 PARDONABLE mean?
PARDONABLE adjective- Capable of being pardoned.