Caveat: adjust leave (6)
I believe the answer is:
vacate
'leave' is the definition.
(vacating is a kind of leaving)
'caveat adjust' is the wordplay.
'adjust' indicates an anagram.
'caveat' is an anagram of 'VACATE'.
(Other definitions for vacate that I've seen before include "Quit" , "Move out and leave empty" , "Caveat - cease to occupy" , "Leave (a place previously occupied)" , "Clear out and leave empty" .)