The most common and most likely answer to this crossword clue is the 4 letter word RING
I've seen this crossword clue in The Times
R
I
N
G
More clues leading to the result RING
Buddy explains!

The straight part
We know that "Call" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case call = ring.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 RING mean?
RING noun- (physical) A solid object in the shape of a circle.
- (physical) A group of objects arranged in a circle.
- A piece of food in the shape of a ring.
- A place where some sports or exhibitions take place; notably a circular or comparable arena, such as a boxing ring or a circus ring; hence the field of a political contest.
- An exclusive group of people, usually involving some unethical or illegal practices.
- A group of atoms linked by bonds to form a closed chain in a molecule.
- A planar geometrical figure included between two concentric circles.
- A diacritical mark in the shape of a hollow circle placed above or under the letter; a kroužek.
- An old English measure of corn equal to the coomb or half a quarter.
- A hierarchical level of privilege in a computer system, usually at hardware level, used to protect data and functionality (also protection ring).
- Either of the pair of clamps used to hold a telescopic sight to a rifle.
- The twenty-fifth Lenormand card.
- To enclose or surround.
- To make an incision around; to girdle.
- To attach a ring to, especially for identification.
- To surround or fit with a ring, or as if with a ring.
- To rise in the air spirally.
- To steal and change the identity of (cars) in order to resell them.
- The resonant sound of a bell, or a sound resembling it.
- A pleasant or correct sound.
- A sound or appearance that is characteristic of something.
- A telephone call.
- Any loud sound; the sound of numerous voices; a sound continued, repeated, or reverberated.
- A chime, or set of bells harmonically tuned.
- Of a bell, etc., to produce a resonant sound.
- To make (a bell, etc.) produce a resonant sound.
- To produce (a sound) by ringing.
- To produce the sound of a bell or a similar sound.
- Of something spoken or written, to appear to be, to seem, to sound.
- To telephone (someone).
- To resound, reverberate, echo.
- To produce music with bells.
- To repeat often, loudly, or earnestly.
- An algebraic structure which consists of a set with two binary operations: an additive operation and a multiplicative operation, such that the set is an abelian group under the additive operation, a monoid under the multiplicative operation, and such that the multiplicative operation is distributive with respect to the additive operation.
- An algebraic structure as above, but only required to be a semigroup under the multiplicative operation, that is, there need not be a multiplicative identity element.