The most common and most likely answer to this crossword clue is the 10 letter word EQUANIMITY
I've seen this crossword clue in The Guardian
E
Q
U
A
N
I
M
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T
Y
More clues leading to the result EQUANIMITY
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 = equanimity.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 EQUANIMITY mean?
EQUANIMITY noun- The state of being calm, stable and composed, especially under stress.