The most common and most likely answer to this crossword clue is the 6 letter word LENITY
I've seen this crossword clue in The Daily Telegraph
L
E
N
I
T
Y
More clues leading to the result LENITY
- Being kind of naive at first, it’s going in a straight line
- Lots let off at first when one’s accepted clemency
- Mildness of one in austere period beginning to yield
- Man heading business community not about to show tolerance
- Fool standing in pasture’s shown clemency
- Gentleness keeping idiot in line
- Lacking restraints, old men unite with yen for clemency
- Senility is not allowed, to be dealt with tolerance
Buddy explains!

The straight part
We know that "clemency" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case clemency = lenity.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 LENITY mean?
LENITY noun- Leniency
- Mercy
- Forgiveness