Game Changing Mistake For A World Cup Defender Crossword Clue7 Letters

One confident answer with explanation of the wordplay

OWNGOAL
Best match
O
W
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G
O
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An "own goal" is literally a game-changing mistake made by a defender (scoring for the opposing team), and it's directly associated with World Cup soccer/football. "OWN GOAL" is 7 letters (OWNGOAL) and perfectly fits the clue's wordplay combining "game-changing mistake" with "World Cup defender."

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Other possible answers
BLUNDERA 'blunder' is a game-changing mistake, 7 letters, though less specifically tied to a World Cup defender context.
OFFSIDEA common defensive mistake in soccer/World Cup play, exactly 7 letters, though it's a rule violation rather than a 'mistake' per se.
FUMBLEDA mistake made by a defender, 7 letters, but more associated with American football than World Cup soccer.

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