"One-hit" is a compound adjective modifying the noun wonder.
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Yes technically he was a one it wonder.
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The cast of One Hit Wonder - 2011 includes: Dominic Sandbrook as
himself
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The song 'The Ketchup Song' by the group Las Ketchup was
considered a one hit wonder. This song is considered a good one hit
wonder because of it's catchy beat and lyrics.