16 across
Trashy,
somewhat
lumpen
affair
(4)
Trashy, somewhat lumpen affair (4)
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The definition is at the beginning of the clue.
How the clue works
See "somewhat" there — that's your nod to a hidden word, tucked inside "lumpeN AFFair". Pull out those letters and you get the answer, and Trashy is the definition, meaning cheap or tacky.