See what's handed in before leaving (6)
I believe the answer is:
notice
I believe this clue is a double definition.
'see' is the first definition.
(notice can mean to see or realise)
'what's handed in before leaving' is the second definition.
(as in handing your notice in when resigning)
(Other definitions for notice that I've seen before include "Advance indication of intention to resign" , "Announcement (of the sack?)" , "Advance warning of job resignation" , "Observe, percieve" , "Take cognisance of, observe" .)