Submerged threat Crossword Clue

Today's (14 January 2018) crossword provided to us by L.A. Times Daily and the clue is "Submerged threat".
The right answer or rather the best answer for the "Submerged threat" is:

Best Answer REEF

Crossword Date: 14 January 2018

Note: The L.A. Times Daily clue "Submerged threat" has multiple solutions for the given crossword puzzle. We apologize for the confusion, especially if there are other solutions to this crossword.
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