Speak about number being flowery (6)
I believe the answer is:
ornate
'flowery' is the definition.
(synonyms)
'speak about number' is the wordplay.
'speak' becomes 'orate' (orating is a kind of speaking).
'about' means one lot of letters goes inside another.
'number' becomes 'n'.
'orate' enclosing 'n' is 'ORNATE'.
'being' is the link.
(Other definitions for ornate that I've seen before include "Heavily decorated" , "Elaborately decorated, perhaps overdone" , "Are not (anag.)" , "Elaborate, flowery" , "Detailed" .)