A safe haven (6)
I believe the answer is:
asylum
'a safe haven' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for asylum that I've seen before include "Refuge or home for mentally ill" , "Haven or hospital for the mentally ill" , "find sanctuary there" , "Institution for care of the insane" , "Place of shelter or refuge" .)