Free from harm (6)
'free from harm' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for safe that I've seen before include "Secure - place to keep cash" , "Strongbox; secure" , "Metal box for security" , "Free from risk" , "Secure and free from danger" .)
(Other definitions for rescue that I've seen before include "Save someone from a dangerous situation" , "Set free from harm and evil" , "delivery" , "Extricate" , "Salvage" .)