The most common and most likely answer to this crossword clue is the 4 letter word KEMP
K
E
M
P
Buddy explains!
The straight part
We know that "Competition for harvesters/Competition for harvesters" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case competition for harvesters/competition for harvesters = kemp.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 KEMP mean?
KEMP noun- Coarse, rough hair, wool, or fur; (in the plural) knotty hairs that will not felt.
- Shaggy; rough.
- A contest in work, etc.
- To strive or contend in any way; strive for victory.
- A champion; a knight.