Detectives scent returning trouble (7)

I believe the answer is:

disturb

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'trouble' is the definition.
(I know that trouble can be written as disturb)

'detectives scent returning' is the wordplay.
'detectives' becomes 'dis' (Detective Inspectors, DIs).
'scent' becomes 'brut' (I can't explain this - if you can you should give a lot more credence to this answer).
'returning' shows that the letters should be reversed in order.
'brut' backwards is 'turb'.
'dis'+'turb'='DISTURB'

Can you help me to learn more?

(Other definitions for disturb that I've seen before include "Interrupt, annoy" , "Interrupt (sleep)" , "startle" , "Break" , "Bother" .)

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