The most common and most likely answer to this crossword clue is the 6 letter word AUTHOR
I've seen this crossword clue in The Sunday Telegraph
A
U
T
H
O
R
More clues leading to the result AUTHOR
- A universal god creator
- Garcia Marquez, for one, nevertheless bathed in aura endlessly
- Someone who writes in French, to the Thunderer?
- Car on run passing Henry 25 for one
- Write out earth’s prime locations when travelling
- Architect gold-plated exterior of triumphal arch
- Two lots of gold rings extremely tough for creator
- Removing clothes, man cuts short writer
- Source gold after gold filling falls out of tooth
- Golden god for writer
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 = author.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 AUTHOR mean?
AUTHOR noun- The originator or creator of a work, especially of a literary composition.
- Someone who writes books for a living.
- One's authority for something: an informant.
- (sometimes proscribed) To create a work as its author.