The most common and most likely answer to this crossword clue is the 6 letter word PACIFY
I've seen this crossword clue in Financial Times
P
A
C
I
F
Y
More clues leading to the result PACIFY
- Calm, provided defended by fleet
- Get calm fast, if cuddled
- Quick to conceal tiff, at heart calm
- Calm provided in fast-moving surroundings
- Calm secretary provided in city suburbs
- Restriction lifted, provided end of 26 is calm
- Quick to round on condition that’s still trouble
- Lively embraces providing calm
- Calm down quickly if captured
- Quick hugs providing calm
Buddy explains!

The straight part
We know that "Calm" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case calm = pacify.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 PACIFY mean?
PACIFY verb- To bring peace to (a place or situation), by ending war, fighting, violence, anger or agitation.
- To appease (someone).