No longer valid (6)
(Other definitions for lapsed that I've seen before include "Pleads (anag)" , "declined" , "No longer active or practising" , "Ceased to practise faith" , "Expired or slipped back" .)
'no longer valid' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for void that I've seen before include "Empty or vacant, like space" , "Not valid or legally binding" , "Empty space or legally invalid" , "Null or emptiness" , "Gap, absence" .)