Secure standard (6)
I believe the answer is:
staple
This clue is a double definition.
'secure' is the first definition.
(stapling is a kind of securing)
'standard' is the second definition.
(thesaurus)
(Other definitions for staple that I've seen before include "Basic sort of plates" , "Principle - metal fastener" , "e.g. rice, sweetcorn ..." , "means of keeping papers together" , "Paper pin for plates" .)