Crossword Genius

Sound means of detecting arson? (5)

Ross

I believe the answer is:

sonar

I'm a little stuck... Click here to teach me more about this clue!

'sound means' is the definition.
'sonar' can be an answer for 'means' (I have seen 'Means of detecting' mean 'sonar' so perhaps 'means' could also mean 'sonar'). I am not certain of the 'sound' bit.

'detecting arson?' is the wordplay.
'arson' anagrams to 'SONAR'.
Though, I am not clear how the anagram is indicated.

'of' is the link.

Can you help me to learn more?

(Other definitions for sonar that I've seen before include "Underwater echo sounder" , "Undersea sensing system" , "Detection system at sea" , "System to locate underwater objects" , "Echo-sounding equipment" .)

I've seen this clue in the Evening Standard.
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