The most common and most likely answer to this crossword clue is the 4 letter word SETA
I've seen this crossword clue in The Daily Telegraph
S
E
T
A
More clues leading to the result SETA
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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 SETA mean?
SETA noun- A bristle or hair
- The stalk of a moss sporangium, or occasionally in a liverwort.