Openers, sound, creating foundation (8)
I believe the answer is:
keystone
'foundation' is the definition.
(thesaurus)
'openers sound' is the wordplay.
'openers' becomes 'keys' (I've seen this before).
'sound' becomes 'tone' (tone is a kind of sound**).
'keys'+'tone'='KEYSTONE'
'creating' is the link.
(Other definitions for keystone that I've seen before include "everything may depend on it" , "Central principle of a policy" , "Central part of a system" , "important element" , "Central block at the summit of an arch" .)