The most common and most likely answer to this crossword clue is the 5 letter word YAHOO
Y
A
H
O
O
More clues leading to the result YAHOO
- Brute rounds on pretentious toff
- One’s entirely a hoodlum? Or not?
- Excited cry from oaf
- Boor, just starting, you are hearing out, obnoxious
- I’m excited as she’s obscenely coarse
- Grass up old love beast
- Swift beast’s site
- Cry of delight from vulgar sort
- Lout‘s gleeful cry
- Swift creature loves to go on grass, rolling over
Buddy explains!

The straight part
We know that "coarse fellow" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case coarse fellow = yahoo.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 YAHOO mean?
YAHOO noun- A rough, coarse, loud or uncouth person; yokel; lout.
- A humanoid cryptid said to exist in parts of eastern Australia, and also reported in the Bahamas.
- To give a cry of "yahoo".
- To search using the Yahoo! search engine.
- An exclamation of joy or enjoyment.
- A battle cry.