The most common and most likely answer to this crossword clue is the 4 letter word MACK
I've seen this crossword clue in The Guardian
M
A
C
K
More clues leading to the result MACK
Buddy explains!
The straight part
We know that "Coat" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case coat = mack.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 MACK mean?
MACK noun- An individual skilled in the art of seduction using verbal skills.
- To act as pimp; to pander.
- To seduce or flirt with.
- A raincoat or mackintosh.
- An element of a ship's superstructure which places the function of a ship's mast on its exhaust stack, adding the skeletal supporting structure to the smokestack to support the mast's complement of functions.