Out of (4)
'out of' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for from that I've seen before include "Sent by" , "Beginning at; out of" , "Springing out of" .)
(Other definitions for sync that I've seen before include "go together" , "Relationship when things occur at the same time" , "In which things occur simultaneously" , "In which one's matching" , "Unison (abbrev.)" .)