Speak about name that's flowery (6)
I believe the answer is:
ornate
'flowery' is the definition.
(I know that flowery can be written as ornate)
'speak about name' is the wordplay.
'speak' becomes 'orate' (orating is a kind of speaking).
'about' indicates putting letters inside.
'name' becomes 'n' (common abbreviation e.g. on forms).
'orate' going around 'n' is 'ORNATE'.
'that's' acts as a link.
(Other definitions for ornate that I've seen before include "(Of literary style) complex and with unusual words" , "Over-elaborate" , "Richly adorned and elaborate" , "Elaborate, flowery" , "Heavily decorated" .)