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Piece
of
crossword
that’s
out
of
date
(6)
Piece of crossword that’s out of date (6)
hints
0
checks
0
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The whole clue is the definition (& lit or double definition).
How the clue works
Piece of crossword gives you a square on the grid, and then out of date does the same job from the other direction — someone hopelessly unfashionable is a square. It's a double definition, with both halves landing on the same answer.