The most common and most likely answer to this crossword clue is the 6 letter word GAUCHO
I've seen this crossword clue in The Sunday Telegraph
G
A
U
C
H
O
More clues leading to the result GAUCHO
- Endlessly awkward old South American cowboy
- Clumsy to get nothing for ultimately game S American cowboy
- Mostly awkward round plainsman
- Finish off ungainly old cowboy
- Not entirely clumsy, old cowboy
- Cowboy with a cough in a bad way
- Cowboy developing a cough
- Oscar supports largely tactless cowboy
- Cowboy left in Haiti has 9 for Spain
- Cowboy recovered from a cough
Buddy explains!

The straight part
We know that "cowboy" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case cowboy = gaucho.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 GAUCHO mean?
GAUCHO noun- A cowboy of the South American pampas.