Arson solved by echo-location (5)
I believe the answer is:
sonar
'echo-location' is the definition.
I can't tell whether this definition defines the answer.
'arson solved' is the wordplay.
'solved' indicates an anagram (the anagram must be solved).
'arson' with letters rearranged gives 'SONAR'.
'by' is the link.
Can you help me to learn more?
(Other definitions for sonar that I've seen before include "Underwater detection device" , "Echo sounder - arson (anag)" , "Device for detecting objects under water with sound waves" , "What a near-blind creature uses" , "Locating device" .)