Leaves working site, cross inside (5)
I believe the answer is:
exits
'leaves' is the definition.
('exit' can be a synonym of 'leave')
'working site cross inside' is the wordplay.
'working' indicates anagramming the letters.
'cross' becomes 'x' (an X is a cross).
'inside' is an insertion indicator.
'site' anagrammed gives 'eits'.
'eits' placed around 'x' is 'EXITS'.
(Other definitions for exits that I've seen before include "Withdraws" , "Goes out, leaves" , "Ways out" , "Egresses" , "Departs" .)