The most common and most likely answer to this crossword clue is the 5 letter word SULCI
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Buddy explains!
The straight part
We know that "furrows" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case furrows = sulci.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 SULCI mean?
SULCI noun- A furrow or groove in an organ or a tissue.
- Any of the grooves that mark the convolutions of the surface of the brain.
- A region of subparallel grooves or ditches formed by a geological process.