Lapsed (7)
'lapsed' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for expired that I've seen before include "brought to an end" , "Ran out or died" , "Lapsed" , "Came to an end" , "Run out" .)
(Other definitions for slipped that I've seen before include "Slid" , "Made an error" , "made a mistake" .)