Crossword Genius

What a bell buoy warns of (5)

Ross

I believe the answer is:

shoal

'what a bell buoy warns of' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for shoal that I've seen before include "shallow water" , "A great number of fish swimming together" , "School of fish" , "Swarm of fish" , "Collection of fish" .)

I've seen this clue in the Newsday and the Newsday.com.
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