3 down
Once
more
show
up
a
rep
being
doubly
wrong
(8)
Once more show up a rep being doubly wrong (8)
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The definition is at the beginning of the clue.
How the clue works
The definition is Once more show up — to appear again. For the wordplay, take "a rep" and double it (as the clue says "doubly") to get AREPAREP, then jumble the whole lot with wrong as your anagram indicator, and out comes REAPPEAR.