Leaders go to the bottom with crime detector (5)
I believe the answer is:
sonar
'detector' is the definition.
(I have seen 'Underwater detector ' mean 'sonar' so perhaps 'detector' could also mean 'sonar')
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for sonar that I've seen before include "Locating device" , "Underwater detection device" , "Device for detecting objects under water with sound waves" , "Echo-sounding device" , "Underwater detector" .)