Words that provide access (4,6)
I believe the answer is:
open sesame
'words that provide access' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for open sesame that I've seen before include "spelling words?" , "Spell unlocking doors" , "a very successful means of achieving a result" , "Magic password" , "door-unlocking spell" .)