The most common and most likely answer to this crossword clue is the 9 letter word RANCHEROS
I've seen this crossword clue in The Times
R
A
N
C
H
E
R
O
S
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The straight part
We know that "Farmers" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case farmers = rancheros.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 RANCHEROS mean?
RANCHEROS noun- (of Mexico) A rancher or herdsman; a peasant employed on a ranch or rancho.
- (of Mexico) The owner and occupant of a ranch or rancho.