The most common and most likely answer to this crossword clue is the 4 letter word PAWL
P
A
W
L
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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 PAWL mean?
PAWL noun- A pivoted catch designed to fall into a notch on a ratchet wheel so as to allow movement in only one direction (e.g. on a windlass or in a clock mechanism), or alternatively to move the wheel in one direction.
- A similar device to prevent motion in other mechanisms besides ratchets.
- To stop with a pawl.