23 down
Expected
to
swallow
diamonds
–
initially
stomach
swells
(5)
Expected to swallow diamonds – initially stomach swells (5)
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How the clue works
The definition is swells, as in fashionable men or dandies. For the wordplay, take DUE (expected) and have it swallow D (diamonds), which gives DUDE. Then add S, the first letter of "stomach" (that's what "initially" is telling you to do).