Crossword Genius

Arson using navigation aid (5)

Ross

I believe the answer is:

sonar

'navigation aid' is the definition.
(I've seen this in another clue)

'arson using' is the wordplay.
'using' indicates anagramming the letters (the letters used in a different way).
'arson' is an anagram of 'SONAR'.

(Other definitions for sonar that I've seen before include "Underwater detection device" , "Underwater location equipment" , "System to locate underwater objects" , "Undersea sensing system" , "Underwater echo sounder" .)

I've seen this clue in The Mirror.
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