The most common and most likely answer to this crossword clue is the 6 letter word SMOOTH
S
M
O
O
T
H
More clues leading to the result SMOOTH
- Unruffled sound from cow in south
- Call for quiet, keeping debate calm
- Still difficult to sit in silence
- Mellow sound made by farm animal in south
- Easy and quiet, containing debate
- Way to get height to pass over low plane
- Facilitate low temperature within Slough’s environs
- Suave drink that is chucked away
- Iron Maiden shoot off touring
- Low temperature in quiet flat
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 = smooth.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 SMOOTH mean?
SMOOTH noun- Something that is smooth, or that goes smoothly and easily.
- A smoothing action.
- A domestic animal having a smooth coat.
- A member of an anti-hippie fashion movement in 1970s Britain.
- The analysis obtained through a smoothing procedure.
- To make smooth or even.
- To make straightforward or easy.
- To calm or palliate.
- (image processing, digital audio) To capture important patterns in the data, while leaving out noise.
- To stroke; especially to stroke an animal's fur.
- Having a texture that lacks friction. Not rough.
- Without difficulty, problems, or unexpected consequences or incidents.
- Bland; glib.
- Flowing or uttered without check, obstruction, or hesitation; not harsh; fluent.
- (of a person) Suave; sophisticated.
- (of an action) Natural; unconstrained.
- (of a motion) Unbroken.
- (chiefly of water) Placid, calm.
- (of an edge) Lacking projections or indentations; not serrated.
- (of food or drink) Not grainy; having an even texture.
- (of a beverage) Having a pleasantly rounded flavor; neither rough nor astringent.
- (of a function) Having derivatives of all finite orders at all points within the function’s domain.
- (of a number) That factors completely into small prime numbers.
- (of a vowel) Lacking marked aspiration.
- (of muscles) Involuntary and non-striated.
- Smoothly.