Criminal in the end bringing worry, I hesitate to say (8)
I believe the answer is:
gangster
'criminal' is the definition.
(gangster is a kind of criminal)
'end bringing worry i hesitate to say' is the wordplay.
'end' indicates one should take the final letters.
'worry' becomes 'angst' (angst means worry or dread).
'i hesitate to say' becomes 'er' (expression used when hesitating).
The last letter of 'bringing' is 'g'.
'g'+'angst'+'er'='GANGSTER'
'in the' acts as a link.
(Other definitions for gangster that I've seen before include "One of a group of violent criminals" , "Organised criminal" , "Villain" , "Hoodlum" , "Mobster" .)