Crossword Genius

Lab warning (4)

Ross

I believe the answer is:

bark

'lab warning' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for bark that I've seen before include "Animal sound - layer protecting tree trunk" , "possibly causing alarm in 23 [CATTERY] ?" , "Dog's sound" , "Shout gruffly; part of tree" , "Sound from animal < having part of tree" .)

I've seen this clue in the LA Times.
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