10 across
Stable
houses
setter
–
was
one
lost?
(4)
Stable houses setter – was one lost? (4)
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The definition is at the beginning of the clue.
How the clue works
Stable houses is the definition — mews are converted stable buildings used as houses. The wordplay starts with "setter," which in crossword convention refers to the person writing the clue, giving ME. Then "was" has "one" (the letter A) removed or "lost," leaving W and S. Put them all together: ME + W + S = MEWS.