18 across
Frame
in
which
beauty
pageant
winner
appears?
(4)
Frame in which beauty pageant winner appears? (4)
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The whole clue is the definition (& lit or double definition).
How the clue works
This is a double definition with a bit of misdirection from the linking words. A Frame can be a sash (as in a sash window), and a beauty pageant winner appears wearing one — the ribbon draped across the shoulder.