Declarations made by you and me, say, about building material (14)
I believe the answer is:
pronouncements
'declarations' is the definition.
(pronouncement is a kind of declaration)
'you and me say about building material' is the wordplay.
'you and me say' becomes 'pronouns' (I can't justify this - if you can you should give a lot more credence to this answer).
'about' is an insertion indicator.
'building material' becomes 'cement' (cement is a kind of building material).
'pronouns' going around 'cement' is 'PRONOUNCEMENTS'.
'made by' is the link.
Can you help me to learn more?
(Other definitions for pronouncements that I've seen before include "declarations" , "assertions" .)