Detectives crack, getting wind up (8)
I believe the answer is:
dissolve
'wind up' is the definition.
(as in winding up a business)
'detectives crack getting' is the wordplay.
'detectives' becomes 'dis' (Detective Inspectors, DIs).
'crack' becomes 'solve' (crack can mean to solve or decipher).
'getting' is a charade indicator (letters next to each other).
'dis'+'solve'='DISSOLVE'
(Other definitions for dissolve that I've seen before include "A smooth change from one film image to another" , "End a legal partnership" , "Melt in water" , "Liquefy; dismiss (Parliament)" , "Annul (a marriage, etc)" .)