Unleash (6)
I believe the answer is:
detach
'unleash' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for detach that I've seen before include "Separate from, remove part" , "Break off, come away" , "free" , "His timid love song (T. S. Eliot)" , "The reverse of 11 Down" .)