Quote sense, say (4)
I believe the answer is:
cite
'quote' is the definition.
(I know that quote is a more specific form of cite)
'sense say' is the wordplay.
'sense' becomes 'sight' (sight or vision is a sense).
'say' shows a homophone (sound like).
'sight' sounds like 'CITE'.
(Other definitions for cite that I've seen before include "name" , "Quote or refer to" , "Make reference to" , "Mention as example or quote" , "Repeat a passage from some written work" .)