Crossword Genius

Sonar echo (4)

Ross

I believe the answer is:

ping

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sonar echo</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for ping that I've seen before include "Abrupt high-pitched ringing sound" , "Sharp ringing sound" , "Short high-pitched sound" .)

I've seen this clue in The Times.
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