Disconnect (6)
I believe the answer is:
detach
'disconnect' is the definition.
(I know that detach is a more specific form of the action disconnect)
This is the entire clue.
(Other definitions for detach that I've seen before include "Disengage, unfasten" , "Break off, come away" , "free" , "Disengage (something) and remove it" , "The reverse of 11 Down" .)