Fixed, fastened (6)
I believe the answer is:
secure
This clue is a double definition.
'fixed' is the first definition.
(thesaurus)
'fastened' is the second definition.
(thesaurus)
(Other definitions for secure that I've seen before include "properly restrained" , "Free from danger or risk" , "Safe and unthreatened" , "land" , "Safe; fixed" .)