Speak about pole that's embellished (6)
I believe the answer is:
ornate
'embellished' is the definition.
(synonyms)
'speak about pole' is the wordplay.
'speak' becomes 'orate' (orating is a kind of speaking).
'about' indicates putting letters inside.
'pole' becomes 'n' (abbreviation for North, as in North Pole).
'orate' placed around 'n' is 'ORNATE'.
'that's' acts as a link.
(Other definitions for ornate that I've seen before include "Are not (anag.)" , "Detailed" , "Heavily decorated" , "Elaborate, flowery" , "Highly decorative" .)