The most common and most likely answer to this crossword clue is the 4 letter word COAX
I've seen this crossword clue in The Guardian
C
O
A
X
More clues leading to the result COAX
- Flatter type of cable
- Type of cable, about 57% flatter
- Urge for fizzy drinks, reportedly
- Flatter fizzy drinks for the audience
- Cable‘s attempt to influence
- Flatter area fenced in by stern fellow
- Attempt to manipulate by following fuel cut
- Fizzy drinks, when poured out, becoming flatter
- Trick giving up heroin for cocaine to persuade
- Cocaine’s picked up to tempt
Buddy explains!

The straight part
We know that "Urge" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case urge = coax.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 COAX mean?
COAX noun- A simpleton; a dupe.
- To fondle, kid, pet, tease.
- To wheedle, persuade (a person, organisation, animal etc.) gradually or by use of flattery to do something.
- To carefully manipulate into a particular desired state, situation or position.
- Short for coaxial cable.
- Having a common central axis