Crossword Genius

Early form of sonar developed by the British between the two world wars (inits) (5)

Ross

I believe the answer is:

asdic

(Other definitions for asdic that I've seen before include "Sound means of detection" , "Submarine detection device" , "aid to detection" , "Early form of sonar" , "It sounds" .)

I've seen this clue in The Mirror.
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