The most common and most likely answer to this crossword clue is the 4 letter word SIFT
I've seen this crossword clue in Independent
S
I
F
T
More clues leading to the result SIFT
- Sort of condition that’s set in stone
- Filter paper is raised aloft
- Examine fellow found hiding in hold
- What posers do, including following riddle
- Separate Lives reviewed by newspaper
- Examine condition in street
- Sort through one’s mounting paper
- Screen, if getting in the way
- Person revered pens poem and riddle
- Riddle involves a Kipling poem, in a way
Buddy explains!

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.