Decorative old service appearing with tea prepared (6)
I believe the answer is:
ornate
'decorative' is the definition.
(I've seen this before)
'old service appearing with tea prepared' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'service' becomes 'rn' (abbreviation for Royal Navy).
'appearing with' says to put letters next to each other.
'prepared' indicates an anagram.
'tea' with letters rearranged gives 'ate'.
'o'+'rn'+'ate'='ORNATE'
(Other definitions for ornate that I've seen before include "Baroque" , "Richly decorated, perhaps too much so" , "Elaborate, flowery" , "Flash" , "Richly or elaborately decorated" .)