Number have spoken about noise (7)
I believe the answer is:
ordinal
'number' is the definition.
(I know that ordinal is a type of number)
'spoken about noise' is the wordplay.
'spoken' becomes 'oral' (similar in meaning).
'about' is an insertion indicator.
'noise' becomes 'din' (din can mean a loud noise or disturbance).
'oral' enclosing 'din' is 'ORDINAL'.
'have' acts as a link.
(Other definitions for ordinal that I've seen before include "(Of numbers) first or second, perhaps" , "Kind of number defining position in series" , "Of position in series; service book (hist.)" , "First and second, say" , "Ranking number" .)