Quote has a sound view (4)
I believe the answer is:
cite
'quote' is the definition.
(I know that quote can be written as cite)
'a sound view' is the wordplay.
'a sound' shows a homophone (sound like).
'view' becomes 'sight' (synonyms).
'sight' sounds like 'CITE'.
'has' is the link.
(Other definitions for cite that I've seen before include "Quote (an author)" , "Adduce as proof" , "Give as an example" , "name" , "Quote as an example or in support" .)