Sue any criminal that's worried (6)
I believe the answer is:
uneasy
'worried' is the definition.
(I've seen this in another clue)
'sue any criminal' is the wordplay.
'criminal' indicates anagramming the letters.
'sue'+'any'='sueany'
'sueany' with letters rearranged gives 'UNEASY'.
'that's' is the link.
(Other definitions for uneasy that I've seen before include "Restless, troubled" , "'Nervous, unsettled (6)'" , "Anxious, nervous" , "Jumpy" , "Tense, edgy" .)