We're told to set kind of update (4)
I believe the answer is:
sync
'kind of update' is the definition.
(synchronization - update to match)
'we're told to set' is the wordplay.
'we're told' indicates a 'sounds like' (homophone) clue.
'to set' becomes 'sink' (to go lower).
'sink' is a homophone of 'SYNC'.
(Other definitions for sync that I've seen before include "Agreement in time" , "Relationship when things occur at the same time" , "In which things occur simultaneously" , "In which one's matching" , "Unison (abbrev.)" .)