Other than (4)
'other than' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for except that I've seen before include "Not including - bar" , "Make a point of not including" , "Not including or leave out" , "Rule out - unless" , "Not including, omit this" .)
(Other definitions for save that I've seen before include "Be economical" , "Except; hoard" , "Deliver from danger" , "Put by in vase" , "Rescue; preserve" .)