Investigator ruined in hustle (6)

I believe the answer is:

sleuth

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'investigator' is the definition.
(sleuth is a kind of investigator)

'ruined in hustle' is the wordplay.
'hustle' anagrams to 'SLEUTH'.
However, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for sleuth that I've seen before include "Hustle (anag)" , "Hustle like detective (6)" , "Hustle for a clever detective like Sherlock" , "Track" , "Detective who follows a trail" .)

I've seen this clue in The Sun.

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