27 across
Wealthy
travellers’
bad
teeth,
black
and
small
within
(3,3,3)
Wealthy travellers’ bad teeth, black and small within (3,3,3)
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The definition is at the beginning of the clue.
How the clue works
Wealthy travellers is the definition. The wordplay involves an anagram of TEETH (indicated by "bad") wrapped around JET (meaning "black") plus S (abbreviation for "small"). The anagram of TEETH gives us THE_ET, and placing JETS (JET + S) "within" that anagram produces THE JET SET.