The most common and most likely answer to this crossword clue is the 4 letter word RUTS
I've seen this crossword clue in The Daily Telegraph
R
U
T
S
More clues leading to the result RUTS
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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 RUTS mean?
RUTS noun- Sexual desire or oestrus of cattle, and various other mammals.
- The noise made by deer during sexual excitement.
- Roaring, as of waves breaking upon the shore; rote.
- A furrow, groove, or track worn in the ground, as from the passage of many wheels along a road.
- A fixed routine, procedure, line of conduct, thought or feeling.
- A dull routine.