Dodgy lawyer retiring — rest regrouping (7)
I believe the answer is:
shyster
'dodgy lawyer' is the definition.
(term for an immoral lawyer)
'retiring rest regrouping' is the wordplay.
'retiring' becomes 'shy' (I've seen this before).
'regrouping' indicates anagramming the letters (I've seen 'regroup' mean this (I've seen this in other clues)).
'rest' anagrammed gives 'ster'.
'shy'+'ster'='SHYSTER'
(Other definitions for shyster that I've seen before include "Dodgy lawyer" , "Person who acts unprofessionally - sounds bashful" , "Crooked bar person" , "Wheeler-dealer" , "Unscrupulous dealer" .)